21023211400 has 48 divisors (see below), whose sum is σ = 49497724800. Its totient is φ = 8302831680.

The previous prime is 21023211397. The next prime is 21023211401. The reversal of 21023211400 is 411232012.

It is not an unprimeable number, because it can be changed into a prime (21023211401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 649492 + ... + 681091.

It is an arithmetic number, because the mean of its divisors is an integer number (1031202600).

Almost surely, 2^21023211400 is an apocalyptic number.

21023211400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023211400 is an abundant number, since it is smaller than the sum of its proper divisors (28474513400).

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

21023211400 is a wasteful number, since it uses less digits than its factorization.

21023211400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330678 (or 1330669 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21023211400 its reverse (411232012), we get a palindrome (21434443412).

The spelling of 21023211400 in words is "twenty-one billion, twenty-three million, two hundred eleven thousand, four hundred".