16721462440 has 32 divisors (see below), whose sum is σ = 37814289480. Its totient is φ = 6654629632.

The previous prime is 16721462431. The next prime is 16721462447. The reversal of 16721462440 is 4426412761.

It can be written as a sum of positive squares in 4 ways, for example, as 14018086404 + 2703376036 = 118398^2 + 51994^2 .

It is a super-2 number, since 2×16721462440² (a number of 21 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 16721462440.

It is not an unprimeable number, because it can be changed into a prime (16721462447) 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, 1053127 + ... + 1068886.

Almost surely, 2^16721462440 is an apocalyptic number.

16721462440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16721462440 is an abundant number, since it is smaller than the sum of its proper divisors (21092827040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16721462440 is a wasteful number, since it uses less digits than its factorization.

16721462440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122221 (or 2122217 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 16721462440 in words is "sixteen billion, seven hundred twenty-one million, four hundred sixty-two thousand, four hundred forty".