11402028602721 has 81 divisors (see below), whose sum is σ = 16997507782801. Its totient is φ = 7365234046800.

The previous prime is 11402028602719. The next prime is 11402028602743. The reversal of 11402028602721 is 12720682020411.

The square root of 11402028602721 is 3376689.

It is a perfect power (a square), and thus also a powerful number.

11402028602721 is a `hidden beast` number, since 1 + 1 + 4 + 0 + 2 + 0 + 28 + 602 + 7 + 21 = 666.

It is not a de Polignac number, because 11402028602721 - 2¹ = 11402028602719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11402028602761) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 59696484736 + ... + 59696484926.

Almost surely, 2^{11402028602721} is an apocalyptic number.

11402028602721 is the 3376689-th square number.

11402028602721 is the 1688345-th centered octagonal number.

It is an amenable number.

11402028602721 is a deficient number, since it is larger than the sum of its proper divisors (5595479180080).

11402028602721 is an frugal number, since it uses more digits than its factorization.

11402028602721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

Multiplying 11402028602721 by its sum of digits (36), we get a square (410473029697956 = 20260134²).

The spelling of 11402028602721 in words is "eleven trillion, four hundred two billion, twenty-eight million, six hundred two thousand, seven hundred twenty-one".