72021473 has 2 divisors, whose sum is σ = 72021474. Its totient is φ = 72021472.

The previous prime is 72021373. The next prime is 72021479. The reversal of 72021473 is 37412027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41628304 + 30393169 = 6452^2 + 5513^2 .

It is a cyclic number.

It is not a de Polignac number, because 72021473 - 2⁸ = 72021217 is a prime.

It is not a weakly prime, because it can be changed into another prime (72021479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36010736 + 36010737.

It is an arithmetic number, because the mean of its divisors is an integer number (36010737).

Almost surely, 2^72021473 is an apocalyptic number.

It is an amenable number.

72021473 is a deficient number, since it is larger than the sum of its proper divisors (1).

72021473 is an equidigital number, since it uses as much as digits as its factorization.

72021473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 72021473 is about 8486.5465885718. The cubic root of 72021473 is about 416.0581175737.

The spelling of 72021473 in words is "seventy-two million, twenty-one thousand, four hundred seventy-three".