21770889591680 has 32 divisors (see below), whose sum is σ = 52046032931640. Its totient is φ = 8708355836416.

The previous prime is 21770889591623. The next prime is 21770889591691. The reversal of 21770889591680 is 8619598807712.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21770889591680² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17008506854 + ... + 17008508133.

Almost surely, 2^{21770889591680} is an apocalyptic number.

21770889591680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21770889591680 is an abundant number, since it is smaller than the sum of its proper divisors (30275143339960).

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

21770889591680 is an equidigital number, since it uses as much as digits as its factorization.

21770889591680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34017015006 (or 34017014994 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 71.

The spelling of 21770889591680 in words is "twenty-one trillion, seven hundred seventy billion, eight hundred eighty-nine million, five hundred ninety-one thousand, six hundred eighty".