21203032120 has 64 divisors (see below), whose sum is σ = 48507036480. Its totient is φ = 8340074496.

The previous prime is 21203032099. The next prime is 21203032127. The reversal of 21203032120 is 2123030212.

It is a junction number, because it is equal to n+sod(n) for n = 21203032094 and 21203032103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203032127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 591757 + ... + 626563.

It is an arithmetic number, because the mean of its divisors is an integer number (757922445).

Almost surely, 2^21203032120 is an apocalyptic number.

21203032120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203032120 is an abundant number, since it is smaller than the sum of its proper divisors (27304004360).

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

21203032120 is a wasteful number, since it uses less digits than its factorization.

21203032120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35072 (or 35068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21203032120 its reverse (2123030212), we get a palindrome (23326062332).

The spelling of 21203032120 in words is "twenty-one billion, two hundred three million, thirty-two thousand, one hundred twenty".