21421200324 has 48 divisors (see below), whose sum is σ = 52647598080. Its totient is φ = 6760202400.

The previous prime is 21421200289. The next prime is 21421200347. The reversal of 21421200324 is 42300212412.

It is a self number, because there is not a number n which added to its sum of digits gives 21421200324.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331249 + ... + 390599.

It is an arithmetic number, because the mean of its divisors is an integer number (1096824960).

Almost surely, 2^21421200324 is an apocalyptic number.

It is an amenable number.

21421200324 is an abundant number, since it is smaller than the sum of its proper divisors (31226397756).

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

21421200324 is a wasteful number, since it uses less digits than its factorization.

21421200324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60960 (or 60958 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21421200324 its reverse (42300212412), we get a palindrome (63721412736).

The spelling of 21421200324 in words is "twenty-one billion, four hundred twenty-one million, two hundred thousand, three hundred twenty-four".