21612562722005 has 32 divisors (see below), whose sum is σ = 26566917780480. Its totient is φ = 16873659348480.

The previous prime is 21612562721969. The next prime is 21612562722041. The reversal of 21612562722005 is 50022726521612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21612562721969) and next prime (21612562722041).

It is not a de Polignac number, because 21612562722005 - 2¹⁴ = 21612562705621 is a prime.

It is a super-2 number, since 2×21612562722005² (a number of 27 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 31 ways as a sum of consecutive naturals, for example, 340908860 + ... + 340972250.

It is an arithmetic number, because the mean of its divisors is an integer number (830216180640).

Almost surely, 2^{21612562722005} is an apocalyptic number.

It is an amenable number.

21612562722005 is a deficient number, since it is larger than the sum of its proper divisors (4954355058475).

21612562722005 is a wasteful number, since it uses less digits than its factorization.

21612562722005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72909.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 21612562722005 in words is "twenty-one trillion, six hundred twelve billion, five hundred sixty-two million, seven hundred twenty-two thousand, five".