21004113042124 has 24 divisors (see below), whose sum is σ = 38692063110960. Its totient is φ = 9949245751296.

The previous prime is 21004113042089. The next prime is 21004113042137. The reversal of 21004113042124 is 42124031140012.

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, 10637724 + ... + 12456700.

It is an arithmetic number, because the mean of its divisors is an integer number (1612169296290).

Almost surely, 2^{21004113042124} is an apocalyptic number.

It is an amenable number.

21004113042124 is a deficient number, since it is larger than the sum of its proper divisors (17687950068836).

21004113042124 is a wasteful number, since it uses less digits than its factorization.

21004113042124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970937 (or 1970935 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21004113042124 its reverse (42124031140012), we get a palindrome (63128144182136).

The spelling of 21004113042124 in words is "twenty-one trillion, four billion, one hundred thirteen million, forty-two thousand, one hundred twenty-four".