21253404416331 has 8 divisors (see below), whose sum is σ = 28338137741520. Its totient is φ = 14168803684352.

The previous prime is 21253404416281. The next prime is 21253404416369. The reversal of 21253404416331 is 13361440435212.

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 21253404416331 - 2¹⁷ = 21253404285259 is a prime.

It is a super-2 number, since 2×21253404416331² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21253404416331.

It is not an unprimeable number, because it can be changed into a prime (21253404416371) 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, 32773686 + ... + 33415883.

It is an arithmetic number, because the mean of its divisors is an integer number (3542267217690).

Almost surely, 2^{21253404416331} is an apocalyptic number.

21253404416331 is a deficient number, since it is larger than the sum of its proper divisors (7084733325189).

21253404416331 is a wasteful number, since it uses less digits than its factorization.

21253404416331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66296605.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 21253404416331 in words is "twenty-one trillion, two hundred fifty-three billion, four hundred four million, four hundred sixteen thousand, three hundred thirty-one".