30121020 has 36 divisors (see below), whose sum is σ = 91367640. Its totient is φ = 8032224.

The previous prime is 30121001. The next prime is 30121043. The reversal of 30121020 is 2012103.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 30120993 and 30121011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83490 + ... + 83849.

It is an arithmetic number, because the mean of its divisors is an integer number (2537990).

Almost surely, 2^30121020 is an apocalyptic number.

30121020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30121020 is an abundant number, since it is smaller than the sum of its proper divisors (61246620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30121020 is a wasteful number, since it uses less digits than its factorization.

30121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167354 (or 167349 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 30121020 is about 5488.2620199841. The cubic root of 30121020 is about 311.1405092212.

Adding to 30121020 its reverse (2012103), we get a palindrome (32133123).

It can be divided in two parts, 301 and 21020, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 30121020 in words is "thirty million, one hundred twenty-one thousand, twenty".