21331002030 has 32 divisors (see below), whose sum is σ = 55132437024. Its totient is φ = 5250708096.

The previous prime is 21331001999. The next prime is 21331002067. The reversal of 21331002030 is 3020013312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27347049 + ... + 27347828.

It is an arithmetic number, because the mean of its divisors is an integer number (1722888657).

Almost surely, 2^21331002030 is an apocalyptic number.

21331002030 is an abundant number, since it is smaller than the sum of its proper divisors (33801434994).

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

21331002030 is a wasteful number, since it uses less digits than its factorization.

21331002030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54694900.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21331002030 its reverse (3020013312), we get a palindrome (24351015342).

The spelling of 21331002030 in words is "twenty-one billion, three hundred thirty-one million, two thousand, thirty".