21887522737 has 2 divisors, whose sum is σ = 21887522738. Its totient is φ = 21887522736.

The previous prime is 21887522711. The next prime is 21887522747. The reversal of 21887522737 is 73722578812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20712678561 + 1174844176 = 143919^2 + 34276^2 .

It is a cyclic number.

It is not a de Polignac number, because 21887522737 - 2⁷ = 21887522609 is a prime.

It is not a weakly prime, because it can be changed into another prime (21887522747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10943761368 + 10943761369.

It is an arithmetic number, because the mean of its divisors is an integer number (10943761369).

Almost surely, 2^21887522737 is an apocalyptic number.

It is an amenable number.

21887522737 is a deficient number, since it is larger than the sum of its proper divisors (1).

21887522737 is an equidigital number, since it uses as much as digits as its factorization.

21887522737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2634240, while the sum is 52.

The spelling of 21887522737 in words is "twenty-one billion, eight hundred eighty-seven million, five hundred twenty-two thousand, seven hundred thirty-seven".