10121020 has 96 divisors (see below), whose sum is σ = 26869248. Its totient is φ = 3117312.

The previous prime is 10121009. The next prime is 10121063. The reversal of 10121020 is 2012101.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 10120994 and 10121012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121899 + ... + 121981.

It is an arithmetic number, because the mean of its divisors is an integer number (279888).

Almost surely, 2^10121020 is an apocalyptic number.

10121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13434624).

10121020 is an abundant number, since it is smaller than the sum of its proper divisors (16748228).

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

10121020 is a wasteful number, since it uses less digits than its factorization.

10121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 10121020 is about 3181.3550572044. The cubic root of 10121020 is about 216.3090853951.

Adding to 10121020 its reverse (2012101), we get a palindrome (12133121).

The spelling of 10121020 in words is "ten million, one hundred twenty-one thousand, twenty".