161421880 has 16 divisors (see below), whose sum is σ = 363199320. Its totient is φ = 64568736.

The previous prime is 161421877. The next prime is 161421901. The reversal of 161421880 is 88124161.

161421880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 2017734 + ... + 2017813.

Almost surely, 2^161421880 is an apocalyptic number.

161421880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161421880 is an abundant number, since it is smaller than the sum of its proper divisors (201777440).

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

161421880 is a wasteful number, since it uses less digits than its factorization.

161421880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4035558 (or 4035554 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 161421880 is about 12705.1910650726. The cubic root of 161421880 is about 544.4869396544.

The spelling of 161421880 in words is "one hundred sixty-one million, four hundred twenty-one thousand, eight hundred eighty".