21201555432424 has 16 divisors (see below), whose sum is σ = 39753009331200. Its totient is φ = 10600752944112.

The previous prime is 21201555432389. The next prime is 21201555432443. The reversal of 21201555432424 is 42423455510212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834457 + ... + 6565015.

It is an arithmetic number, because the mean of its divisors is an integer number (2484563083200).

Almost surely, 2^{21201555432424} is an apocalyptic number.

It is an amenable number.

21201555432424 is a deficient number, since it is larger than the sum of its proper divisors (18551453898776).

21201555432424 is a wasteful number, since it uses less digits than its factorization.

21201555432424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6193032 (or 6193028 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 40.

The spelling of 21201555432424 in words is "twenty-one trillion, two hundred one billion, five hundred fifty-five million, four hundred thirty-two thousand, four hundred twenty-four".