21020203230 has 32 divisors (see below), whose sum is σ = 54329141664. Its totient is φ = 5174203776.

The previous prime is 21020203219. The next prime is 21020203247. The reversal of 21020203230 is 3230202012.

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

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, 26948589 + ... + 26949368.

It is an arithmetic number, because the mean of its divisors is an integer number (1697785677).

Almost surely, 2^21020203230 is an apocalyptic number.

21020203230 is an abundant number, since it is smaller than the sum of its proper divisors (33308938434).

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

21020203230 is a wasteful number, since it uses less digits than its factorization.

21020203230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53897980.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21020203230 its reverse (3230202012), we get a palindrome (24250405242).

The spelling of 21020203230 in words is "twenty-one billion, twenty million, two hundred three thousand, two hundred thirty".