21416371937 has 4 divisors (see below), whose sum is σ = 21416670660. Its totient is φ = 21416073216.

The previous prime is 21416371927. The next prime is 21416371939. The reversal of 21416371937 is 73917361412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9649329361 + 11767042576 = 98231^2 + 108476^2 .

It is a cyclic number.

It is not a de Polignac number, because 21416371937 - 2⁸ = 21416371681 is a prime.

It is a super-2 number, since 2×21416371937² (a number of 21 digits) contains 22 as substring.

It is a deceptive number, since it divides R_21416371936.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21416371939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29873 + ... + 209105.

It is an arithmetic number, because the mean of its divisors is an integer number (5354167665).

Almost surely, 2^21416371937 is an apocalyptic number.

21416371937 is the 119489-th pentagonal number.

It is an amenable number.

21416371937 is a deficient number, since it is larger than the sum of its proper divisors (298723).

21416371937 is a wasteful number, since it uses less digits than its factorization.

21416371937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298722.

The product of its digits is 190512, while the sum is 44.

The spelling of 21416371937 in words is "twenty-one billion, four hundred sixteen million, three hundred seventy-one thousand, nine hundred thirty-seven".