72010521 has 24 divisors (see below), whose sum is σ = 120148704. Its totient is φ = 41074560.

The previous prime is 72010507. The next prime is 72010537. The reversal of 72010521 is 12501027.

It is not a de Polignac number, because 72010521 - 2⁶ = 72010457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72010494 and 72010503.

It is not an unprimeable number, because it can be changed into a prime (72010501) 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, 19711 + ... + 23076.

It is an arithmetic number, because the mean of its divisors is an integer number (5006196).

Almost surely, 2^72010521 is an apocalyptic number.

It is an amenable number.

72010521 is a deficient number, since it is larger than the sum of its proper divisors (48138183).

72010521 is a wasteful number, since it uses less digits than its factorization.

72010521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42821 (or 42818 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 72010521 is about 8485.9013074629. The cubic root of 72010521 is about 416.0370271067.

Adding to 72010521 its reverse (12501027), we get a palindrome (84511548).

The spelling of 72010521 in words is "seventy-two million, ten thousand, five hundred twenty-one".