89129490921 has 24 divisors (see below), whose sum is σ = 129076234560. Its totient is φ = 59265822816.

The previous prime is 89129490917. The next prime is 89129490929. The reversal of 89129490921 is 12909492198.

89129490921 is a `hidden beast` number, since 8 + 9 + 129 + 490 + 9 + 21 = 666.

It is not a de Polignac number, because 89129490921 - 2² = 89129490917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89129490929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9035490 + ... + 9045348.

It is an arithmetic number, because the mean of its divisors is an integer number (5378176440).

Almost surely, 2^89129490921 is an apocalyptic number.

It is an amenable number.

89129490921 is a deficient number, since it is larger than the sum of its proper divisors (39946743639).

89129490921 is a wasteful number, since it uses less digits than its factorization.

89129490921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12365 (or 12362 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The spelling of 89129490921 in words is "eighty-nine billion, one hundred twenty-nine million, four hundred ninety thousand, nine hundred twenty-one".