72192021 has 32 divisors (see below), whose sum is σ = 108501120. Its totient is φ = 42316800.

The previous prime is 72192011. The next prime is 72192023. The reversal of 72192021 is 12029127.

It is not a de Polignac number, because 72192021 - 2⁶ = 72191957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72191982 and 72192000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72192023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309721 + ... + 309953.

It is an arithmetic number, because the mean of its divisors is an integer number (3390660).

It is a Poulet number, since it divides 2^72192020-1.

Almost surely, 2^72192021 is an apocalyptic number.

It is an amenable number.

72192021 is a deficient number, since it is larger than the sum of its proper divisors (36309099).

72192021 is a wasteful number, since it uses less digits than its factorization.

72192021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 72192021 is about 8496.5887860953. The cubic root of 72192021 is about 416.3862694459.

The spelling of 72192021 in words is "seventy-two million, one hundred ninety-two thousand, twenty-one".