21021422324 has 24 divisors (see below), whose sum is σ = 42670353600. Its totient is φ = 8874714816.

The previous prime is 21021422249. The next prime is 21021422339. The reversal of 21021422324 is 42322412012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021422324.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5600849 + ... + 5604600.

It is an arithmetic number, because the mean of its divisors is an integer number (1777931400).

Almost surely, 2^21021422324 is an apocalyptic number.

It is an amenable number.

21021422324 is an abundant number, since it is smaller than the sum of its proper divisors (21648931276).

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

21021422324 is a wasteful number, since it uses less digits than its factorization.

21021422324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11205527 (or 11205525 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21021422324 its reverse (42322412012), we get a palindrome (63343834336).

The spelling of 21021422324 in words is "twenty-one billion, twenty-one million, four hundred twenty-two thousand, three hundred twenty-four".