21016387416 has 32 divisors (see below), whose sum is σ = 52712130240. Its totient is φ = 6982640928.

The previous prime is 21016387409. The next prime is 21016387423. The reversal of 21016387416 is 61478361012.

It is an interprime number because it is at equal distance from previous prime (21016387409) and next prime (21016387423).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1418826 + ... + 1433561.

It is an arithmetic number, because the mean of its divisors is an integer number (1647254070).

Almost surely, 2^21016387416 is an apocalyptic number.

It is an amenable number.

21016387416 is an abundant number, since it is smaller than the sum of its proper divisors (31695742824).

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

21016387416 is a wasteful number, since it uses less digits than its factorization.

21016387416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852703 (or 2852699 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 21016387416 in words is "twenty-one billion, sixteen million, three hundred eighty-seven thousand, four hundred sixteen".