21010400664481 has 8 divisors (see below), whose sum is σ = 21037947315840. Its totient is φ = 20982859977792.

The previous prime is 21010400664469. The next prime is 21010400664493. The reversal of 21010400664481 is 18446600401012.

It is an interprime number because it is at equal distance from previous prime (21010400664469) and next prime (21010400664493).

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 21010400664481 - 2¹⁵ = 21010400631713 is a prime.

It is a super-3 number, since 3×21010400664481³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010400664481.

It is not an unprimeable number, because it can be changed into a prime (21010400664401) 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, 5580361 + ... + 8553433.

It is an arithmetic number, because the mean of its divisors is an integer number (2629743414480).

Almost surely, 2^{21010400664481} is an apocalyptic number.

It is an amenable number.

21010400664481 is a deficient number, since it is larger than the sum of its proper divisors (27546651359).

21010400664481 is an equidigital number, since it uses as much as digits as its factorization.

21010400664481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982335.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 21010400664481 in words is "twenty-one trillion, ten billion, four hundred million, six hundred sixty-four thousand, four hundred eighty-one".