72011111011021 has 24 divisors (see below), whose sum is σ = 91087563525504. Its totient is φ = 56422660704480.

The previous prime is 72011111011013. The next prime is 72011111011069. The reversal of 72011111011021 is 12011011111027.

It is not a de Polignac number, because 72011111011021 - 2³ = 72011111011013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72011111011021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72011111014021) 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, 548707545 + ... + 548838766.

It is an arithmetic number, because the mean of its divisors is an integer number (3795315146896).

Almost surely, 2^{72011111011021} is an apocalyptic number.

It is an amenable number.

72011111011021 is a deficient number, since it is larger than the sum of its proper divisors (19076452514483).

72011111011021 is a wasteful number, since it uses less digits than its factorization.

72011111011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097546441 (or 1097546434 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 19.

Adding to 72011111011021 its reverse (12011011111027), we get a palindrome (84022122122048).

The spelling of 72011111011021 in words is "seventy-two trillion, eleven billion, one hundred eleven million, eleven thousand, twenty-one".