21626721666053 has 16 divisors (see below), whose sum is σ = 24874367232000. Its totient is φ = 18418611085056.

The previous prime is 21626721666023. The next prime is 21626721666083. The reversal of 21626721666053 is 35066612762612.

It is an interprime number because it is at equal distance from previous prime (21626721666023) and next prime (21626721666083).

It is not a de Polignac number, because 21626721666053 - 2²⁸ = 21626453230597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21626721665986 and 21626721666004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21626721666013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42722573 + ... + 43225821.

It is an arithmetic number, because the mean of its divisors is an integer number (1554647952000).

Almost surely, 2^{21626721666053} is an apocalyptic number.

It is an amenable number.

21626721666053 is a deficient number, since it is larger than the sum of its proper divisors (3247645565947).

21626721666053 is a wasteful number, since it uses less digits than its factorization.

21626721666053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542516.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 21626721666053 in words is "twenty-one trillion, six hundred twenty-six billion, seven hundred twenty-one million, six hundred sixty-six thousand, fifty-three".