21497374037 has 2 divisors, whose sum is σ = 21497374038. Its totient is φ = 21497374036.

The previous prime is 21497374009. The next prime is 21497374091. The reversal of 21497374037 is 73047379412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20258967556 + 1238406481 = 142334^2 + 35191^2 .

It is a cyclic number.

It is not a de Polignac number, because 21497374037 - 2²² = 21493179733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21497373982 and 21497374000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21497374537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748687018 + 10748687019.

It is an arithmetic number, because the mean of its divisors is an integer number (10748687019).

Almost surely, 2^21497374037 is an apocalyptic number.

It is an amenable number.

21497374037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21497374037 is an equidigital number, since it uses as much as digits as its factorization.

21497374037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 47.

The spelling of 21497374037 in words is "twenty-one billion, four hundred ninety-seven million, three hundred seventy-four thousand, thirty-seven".