21515131442224 has 80 divisors (see below), whose sum is σ = 49766554736640. Its totient is φ = 8810185063680.

The previous prime is 21515131442141. The next prime is 21515131442239. The reversal of 21515131442224 is 42224413151512.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2237319 + ... + 6930790.

It is an arithmetic number, because the mean of its divisors is an integer number (622081934208).

Almost surely, 2^{21515131442224} is an apocalyptic number.

It is an amenable number.

21515131442224 is an abundant number, since it is smaller than the sum of its proper divisors (28251423294416).

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

21515131442224 is a wasteful number, since it uses less digits than its factorization.

21515131442224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9169058 (or 9169052 counting only the distinct ones).

The product of its digits is 76800, while the sum is 37.

Adding to 21515131442224 its reverse (42224413151512), we get a palindrome (63739544593736).

The spelling of 21515131442224 in words is "twenty-one trillion, five hundred fifteen billion, one hundred thirty-one million, four hundred forty-two thousand, two hundred twenty-four".