21356500654 has 8 divisors (see below), whose sum is σ = 32077071288. Its totient is φ = 10664143560.

The previous prime is 21356500643. The next prime is 21356500663. The reversal of 21356500654 is 45600565312.

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

It is a super-2 number, since 2×21356500654² (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, 7051492 + ... + 7054519.

It is an arithmetic number, because the mean of its divisors is an integer number (4009633911).

Almost surely, 2^21356500654 is an apocalyptic number.

21356500654 is a deficient number, since it is larger than the sum of its proper divisors (10720570634).

21356500654 is a wasteful number, since it uses less digits than its factorization.

21356500654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14106770.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 21356500654 in words is "twenty-one billion, three hundred fifty-six million, five hundred thousand, six hundred fifty-four".