15042760021 has 4 divisors (see below), whose sum is σ = 15044678572. Its totient is φ = 15040841472.

The previous prime is 15042760001. The next prime is 15042760037. The reversal of 15042760021 is 12006724051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12006724051 = 7 ⋅1715246293.

It can be written as a sum of positive squares in 2 ways, for example, as 7195280625 + 7847479396 = 84825^2 + 88586^2 .

It is a cyclic number.

It is not a de Polignac number, because 15042760021 - 2⁹ = 15042759509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15042760001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947466 + ... + 963211.

It is an arithmetic number, because the mean of its divisors is an integer number (3761169643).

Almost surely, 2^15042760021 is an apocalyptic number.

It is an amenable number.

15042760021 is a deficient number, since it is larger than the sum of its proper divisors (1918551).

15042760021 is an equidigital number, since it uses as much as digits as its factorization.

15042760021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918550.

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 15042760021 in words is "fifteen billion, forty-two million, seven hundred sixty thousand, twenty-one".