21161377016 has 32 divisors (see below), whose sum is σ = 43367474640. Its totient is φ = 9621013248.

The previous prime is 21161376997. The next prime is 21161377019. The reversal of 21161377016 is 61077316112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161377019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1511501 + ... + 1525436.

Almost surely, 2^21161377016 is an apocalyptic number.

21161377016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21161377016 is an abundant number, since it is smaller than the sum of its proper divisors (22206097624).

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

21161377016 is a wasteful number, since it uses less digits than its factorization.

21161377016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3037023 (or 3037019 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 35.

The spelling of 21161377016 in words is "twenty-one billion, one hundred sixty-one million, three hundred seventy-seven thousand, sixteen".