21662151416 has 8 divisors (see below), whose sum is σ = 40616533920. Its totient is φ = 10831075704.

The previous prime is 21662151403. The next prime is 21662151421. The reversal of 21662151416 is 61415126612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1353884456 + ... + 1353884471.

It is an arithmetic number, because the mean of its divisors is an integer number (5077066740).

Almost surely, 2^21662151416 is an apocalyptic number.

It is an amenable number.

21662151416 is a deficient number, since it is larger than the sum of its proper divisors (18954382504).

21662151416 is a wasteful number, since it uses less digits than its factorization.

21662151416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707768933 (or 2707768929 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The spelling of 21662151416 in words is "twenty-one billion, six hundred sixty-two million, one hundred fifty-one thousand, four hundred sixteen".