16212121968 has 120 divisors (see below), whose sum is σ = 48768521472. Its totient is φ = 4627335552.

The previous prime is 16212121967. The next prime is 16212121997. The reversal of 16212121968 is 86912121261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16212121967) 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, 2788921 + ... + 2794727.

Almost surely, 2^16212121968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16212121968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24384260736).

16212121968 is an abundant number, since it is smaller than the sum of its proper divisors (32556399504).

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

16212121968 is a wasteful number, since it uses less digits than its factorization.

16212121968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019 (or 7006 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The spelling of 16212121968 in words is "sixteen billion, two hundred twelve million, one hundred twenty-one thousand, nine hundred sixty-eight".