21356150057437 has 4 divisors (see below), whose sum is σ = 22998930831100. Its totient is φ = 19713369283776.

The previous prime is 21356150057387. The next prime is 21356150057443. The reversal of 21356150057437 is 73475005165312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12046688655556 + 9309461401881 = 3470834^2 + 3051141^2 .

It is a cyclic number.

It is not a de Polignac number, because 21356150057437 - 2¹¹ = 21356150055389 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 (21356150057467) 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, 821390386812 + ... + 821390386837.

It is an arithmetic number, because the mean of its divisors is an integer number (5749732707775).

Almost surely, 2^{21356150057437} is an apocalyptic number.

It is an amenable number.

21356150057437 is a deficient number, since it is larger than the sum of its proper divisors (1642780773663).

21356150057437 is a wasteful number, since it uses less digits than its factorization.

21356150057437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642780773662.

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 21356150057437 in words is "twenty-one trillion, three hundred fifty-six billion, one hundred fifty million, fifty-seven thousand, four hundred thirty-seven".