21437452642855 has 16 divisors (see below), whose sum is σ = 26954802477504. Its totient is φ = 16336243883520.

The previous prime is 21437452642831. The next prime is 21437452642889. The reversal of 21437452642855 is 55824625473412.

It is not a de Polignac number, because 21437452642855 - 2¹⁹ = 21437452118567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21437452642855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386720484 + ... + 386775913.

It is an arithmetic number, because the mean of its divisors is an integer number (1684675154844).

Almost surely, 2^{21437452642855} is an apocalyptic number.

21437452642855 is a deficient number, since it is larger than the sum of its proper divisors (5517349834649).

21437452642855 is a wasteful number, since it uses less digits than its factorization.

21437452642855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773496666.

The product of its digits is 64512000, while the sum is 58.

The spelling of 21437452642855 in words is "twenty-one trillion, four hundred thirty-seven billion, four hundred fifty-two million, six hundred forty-two thousand, eight hundred fifty-five".