21150015432004 has 24 divisors (see below), whose sum is σ = 38622432058560. Its totient is φ = 10115050671264.

The previous prime is 21150015431989. The next prime is 21150015432023. The reversal of 21150015432004 is 40023451005112.

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, 3477142 + ... + 7374994.

It is an arithmetic number, because the mean of its divisors is an integer number (1609268002440).

Almost surely, 2^{21150015432004} is an apocalyptic number.

It is an amenable number.

21150015432004 is a deficient number, since it is larger than the sum of its proper divisors (17472416626556).

21150015432004 is a wasteful number, since it uses less digits than its factorization.

21150015432004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956859 (or 3956857 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21150015432004 its reverse (40023451005112), we get a palindrome (61173466437116).

The spelling of 21150015432004 in words is "twenty-one trillion, one hundred fifty billion, fifteen million, four hundred thirty-two thousand, four".