21215142364 has 24 divisors (see below), whose sum is σ = 39986353568. Its totient is φ = 9790632000.

The previous prime is 21215142343. The next prime is 21215142383. The reversal of 21215142364 is 46324151212.

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, 964489 + ... + 986239.

Almost surely, 2^21215142364 is an apocalyptic number.

It is an amenable number.

21215142364 is a deficient number, since it is larger than the sum of its proper divisors (18771211204).

21215142364 is a wasteful number, since it uses less digits than its factorization.

21215142364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40525 (or 40523 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

Adding to 21215142364 its reverse (46324151212), we get a palindrome (67539293576).

The spelling of 21215142364 in words is "twenty-one billion, two hundred fifteen million, one hundred forty-two thousand, three hundred sixty-four".