16421445720 has 48 divisors (see below), whose sum is σ = 53369699760. Its totient is φ = 4379052096.

The previous prime is 16421445713. The next prime is 16421445763. The reversal of 16421445720 is 2754412461.

16421445720 is a `hidden beast` number, since 1 + 6 + 42 + 1 + 44 + 572 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22807204 + ... + 22807923.

It is an arithmetic number, because the mean of its divisors is an integer number (1111868745).

Almost surely, 2^16421445720 is an apocalyptic number.

16421445720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16421445720 is an abundant number, since it is smaller than the sum of its proper divisors (36948254040).

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

16421445720 is a wasteful number, since it uses less digits than its factorization.

16421445720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45615144 (or 45615137 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 16421445720 in words is "sixteen billion, four hundred twenty-one million, four hundred forty-five thousand, seven hundred twenty".