21201030 has 48 divisors (see below), whose sum is σ = 57030480. Its totient is φ = 5457984.

The previous prime is 21200987. The next prime is 21201031. The reversal of 21201030 is 3010212.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1452 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (1188135).

Almost surely, 2^21201030 is an apocalyptic number.

21201030 is an abundant number, since it is smaller than the sum of its proper divisors (35829450).

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

21201030 is a wasteful number, since it uses less digits than its factorization.

21201030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8165 (or 8162 counting only the distinct ones).

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

The square root of 21201030 is about 4604.4576227825. The cubic root of 21201030 is about 276.7699828649.

Adding to 21201030 its reverse (3010212), we get a palindrome (24211242).

The spelling of 21201030 in words is "twenty-one million, two hundred one thousand, thirty".