21374400423737 has 4 divisors (see below), whose sum is σ = 21515952744576. Its totient is φ = 21232848102900.

The previous prime is 21374400423647. The next prime is 21374400423773. The reversal of 21374400423737 is 73732400447312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21374400423737 - 2¹⁸ = 21374400161593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21374400423691 and 21374400423700.

It is not an unprimeable number, because it can be changed into a prime (21374400423787) 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, 70776160193 + ... + 70776160494.

It is an arithmetic number, because the mean of its divisors is an integer number (5378988186144).

Almost surely, 2^{21374400423737} is an apocalyptic number.

It is an amenable number.

21374400423737 is a deficient number, since it is larger than the sum of its proper divisors (141552320839).

21374400423737 is a wasteful number, since it uses less digits than its factorization.

21374400423737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141552320838.

The product of its (nonzero) digits is 2370816, while the sum is 47.

The spelling of 21374400423737 in words is "twenty-one trillion, three hundred seventy-four billion, four hundred million, four hundred twenty-three thousand, seven hundred thirty-seven".