21621275757031 has 8 divisors (see below), whose sum is σ = 23748769710720. Its totient is φ = 19592735010552.

The previous prime is 21621275757023. The next prime is 21621275757131. The reversal of 21621275757031 is 13075757212612.

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

It is a cyclic number.

It is not a de Polignac number, because 21621275757031 - 2³ = 21621275757023 is a prime.

It is a super-2 number, since 2×21621275757031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621275757131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24738301345 + ... + 24738302218.

It is an arithmetic number, because the mean of its divisors is an integer number (2968596213840).

Almost surely, 2^{21621275757031} is an apocalyptic number.

21621275757031 is a deficient number, since it is larger than the sum of its proper divisors (2127493953689).

21621275757031 is a wasteful number, since it uses less digits than its factorization.

21621275757031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49476603605.

The product of its (nonzero) digits is 1234800, while the sum is 49.

The spelling of 21621275757031 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-five million, seven hundred fifty-seven thousand, thirty-one".