21633566054 has 4 divisors (see below), whose sum is σ = 32450349084. Its totient is φ = 10816783026.

The previous prime is 21633566051. The next prime is 21633566057. The reversal of 21633566054 is 45066533612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21633566051) and next prime (21633566057).

It is a super-2 number, since 2×21633566054² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633566051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5408391512 + ... + 5408391515.

It is an arithmetic number, because the mean of its divisors is an integer number (8112587271).

Almost surely, 2^21633566054 is an apocalyptic number.

21633566054 is a deficient number, since it is larger than the sum of its proper divisors (10816783030).

21633566054 is a wasteful number, since it uses less digits than its factorization.

21633566054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10816783029.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21633566054 in words is "twenty-one billion, six hundred thirty-three million, five hundred sixty-six thousand, fifty-four".