21142120404 has 24 divisors (see below), whose sum is σ = 50922957568. Its totient is φ = 6820038720.

The previous prime is 21142120387. The next prime is 21142120411. The reversal of 21142120404 is 40402124112.

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, 28416457 + ... + 28417200.

Almost surely, 2^21142120404 is an apocalyptic number.

It is an amenable number.

21142120404 is an abundant number, since it is smaller than the sum of its proper divisors (29780837164).

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

21142120404 is a wasteful number, since it uses less digits than its factorization.

21142120404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56833695 (or 56833693 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21142120404 its reverse (40402124112), we get a palindrome (61544244516).

The spelling of 21142120404 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, four hundred four".