21656136214 has 8 divisors (see below), whose sum is σ = 32490456120. Its totient is φ = 10825984176.

The previous prime is 21656136211. The next prime is 21656136221. The reversal of 21656136214 is 41263165612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21656136211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028944 + ... + 1049779.

It is an arithmetic number, because the mean of its divisors is an integer number (4061307015).

Almost surely, 2^21656136214 is an apocalyptic number.

21656136214 is a deficient number, since it is larger than the sum of its proper divisors (10834319906).

21656136214 is a wasteful number, since it uses less digits than its factorization.

21656136214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083934.

The product of its digits is 51840, while the sum is 37.

The spelling of 21656136214 in words is "twenty-one billion, six hundred fifty-six million, one hundred thirty-six thousand, two hundred fourteen".