21200232042 has 48 divisors (see below), whose sum is σ = 50211925920. Its totient is φ = 6411199200.

The previous prime is 21200232029. The next prime is 21200232061. The reversal of 21200232042 is 24023200212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11817 + ... + 206252.

It is an arithmetic number, because the mean of its divisors is an integer number (1046081790).

Almost surely, 2^21200232042 is an apocalyptic number.

21200232042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21200232042 is an abundant number, since it is smaller than the sum of its proper divisors (29011693878).

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

21200232042 is a wasteful number, since it uses less digits than its factorization.

21200232042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218579 (or 218576 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21200232042 its reverse (24023200212), we get a palindrome (45223432254).

The spelling of 21200232042 in words is "twenty-one billion, two hundred million, two hundred thirty-two thousand, forty-two".