192121881 has 16 divisors (see below), whose sum is σ = 292998144. Its totient is φ = 109693584.

The previous prime is 192121861. The next prime is 192121889. The reversal of 192121881 is 188121291.

192121881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 192121881 - 2²¹ = 190024729 is a prime.

It is a super-2 number, since 2×192121881² = 73821634317956322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (192121889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28980 + ... + 34986.

It is an arithmetic number, because the mean of its divisors is an integer number (18312384).

Almost surely, 2^192121881 is an apocalyptic number.

It is an amenable number.

192121881 is a deficient number, since it is larger than the sum of its proper divisors (100876263).

192121881 is a wasteful number, since it uses less digits than its factorization.

192121881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7540.

The product of its digits is 2304, while the sum is 33.

The square root of 192121881 is about 13860.8037645730. The cubic root of 192121881 is about 577.0218737046.

The spelling of 192121881 in words is "one hundred ninety-two million, one hundred twenty-one thousand, eight hundred eighty-one".