21321201352 has 32 divisors (see below), whose sum is σ = 44137003680. Its totient is φ = 9574687360.

The previous prime is 21321201311. The next prime is 21321201353. The reversal of 21321201352 is 25310212312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21321201353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1452253 + ... + 1466860.

It is an arithmetic number, because the mean of its divisors is an integer number (1379281365).

Almost surely, 2^21321201352 is an apocalyptic number.

21321201352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21321201352 is an abundant number, since it is smaller than the sum of its proper divisors (22815802328).

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

21321201352 is a wasteful number, since it uses less digits than its factorization.

21321201352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919213 (or 2919209 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21321201352 its reverse (25310212312), we get a palindrome (46631413664).

The spelling of 21321201352 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, three hundred fifty-two".