21649720176 has 150 divisors (see below), whose sum is σ = 72891082440. Its totient is φ = 6185616192.

The previous prime is 21649720097. The next prime is 21649720193. The reversal of 21649720176 is 67102794612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 106956 + ... + 233963.

Almost surely, 2^21649720176 is an apocalyptic number.

It is an amenable number.

21649720176 is an abundant number, since it is smaller than the sum of its proper divisors (51241362264).

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

21649720176 is a wasteful number, since it uses less digits than its factorization.

21649720176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340953 (or 340931 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 21649720176 in words is "twenty-one billion, six hundred forty-nine million, seven hundred twenty thousand, one hundred seventy-six".