16387469021 has 24 divisors (see below), whose sum is σ = 20715361344. Its totient is φ = 12594216960.

The previous prime is 16387469017. The next prime is 16387469029. The reversal of 16387469021 is 12096478361.

It is not a de Polignac number, because 16387469021 - 2² = 16387469017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16387469029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 390365 + ... + 430301.

It is an arithmetic number, because the mean of its divisors is an integer number (863140056).

Almost surely, 2^16387469021 is an apocalyptic number.

16387469021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16387469021 is a deficient number, since it is larger than the sum of its proper divisors (4327892323).

16387469021 is an equidigital number, since it uses as much as digits as its factorization.

16387469021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40101 (or 40028 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 16387469021 in words is "sixteen billion, three hundred eighty-seven million, four hundred sixty-nine thousand, twenty-one".