400215452142521 has 16 divisors (see below), whose sum is σ = 410036071468800. Its totient is φ = 390397660329600.

The previous prime is 400215452142487. The next prime is 400215452142523. The reversal of 400215452142521 is 125241254512004.

It is a cyclic number.

It is not a de Polignac number, because 400215452142521 - 2⁴⁶ = 329846707964857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400215452142523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13843959815 + ... + 13843988723.

It is an arithmetic number, because the mean of its divisors is an integer number (25627254466800).

Almost surely, 2^{400215452142521} is an apocalyptic number.

400215452142521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

400215452142521 is a deficient number, since it is larger than the sum of its proper divisors (9820619326279).

400215452142521 is a wasteful number, since it uses less digits than its factorization.

400215452142521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66080.

The product of its (nonzero) digits is 128000, while the sum is 38.

The spelling of 400215452142521 in words is "four hundred trillion, two hundred fifteen billion, four hundred fifty-two million, one hundred forty-two thousand, five hundred twenty-one".