16464237255021 has 16 divisors (see below), whose sum is σ = 23246711909568. Its totient is φ = 10329131654400.

The previous prime is 16464237254981. The next prime is 16464237255071. The reversal of 16464237255021 is 12055273246461.

It is a happy number.

It is not a de Polignac number, because 16464237255021 - 2¹¹ = 16464237252973 is a prime.

It is a super-2 number, since 2×16464237255021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16464237255071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21020275 + ... + 21789456.

It is an arithmetic number, because the mean of its divisors is an integer number (1452919494348).

Almost surely, 2^{16464237255021} is an apocalyptic number.

It is an amenable number.

16464237255021 is a deficient number, since it is larger than the sum of its proper divisors (6782474654547).

16464237255021 is a wasteful number, since it uses less digits than its factorization.

16464237255021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42817292.

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 16464237255021 in words is "sixteen trillion, four hundred sixty-four billion, two hundred thirty-seven million, two hundred fifty-five thousand, twenty-one".