21612789742 has 8 divisors (see below), whose sum is σ = 32422473000. Its totient is φ = 10805298744.

The previous prime is 21612789739. The next prime is 21612789767. The reversal of 21612789742 is 24798721612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21612789742² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 523192 + ... + 562987.

It is an arithmetic number, because the mean of its divisors is an integer number (4052809125).

Almost surely, 2^21612789742 is an apocalyptic number.

21612789742 is a deficient number, since it is larger than the sum of its proper divisors (10809683258).

21612789742 is a wasteful number, since it uses less digits than its factorization.

21612789742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096130.

The product of its digits is 677376, while the sum is 49.

The spelling of 21612789742 in words is "twenty-one billion, six hundred twelve million, seven hundred eighty-nine thousand, seven hundred forty-two".