21892695497 has 2 divisors, whose sum is σ = 21892695498. Its totient is φ = 21892695496.

The previous prime is 21892695443. The next prime is 21892695499. The reversal of 21892695497 is 79459629812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21008763136 + 883932361 = 144944^2 + 29731^2 .

It is a cyclic number.

It is not a de Polignac number, because 21892695497 - 2¹⁶ = 21892629961 is a prime.

It is a super-2 number, since 2×21892695497² (a number of 21 digits) contains 22 as substring.

Together with 21892695499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21892695499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946347748 + 10946347749.

It is an arithmetic number, because the mean of its divisors is an integer number (10946347749).

Almost surely, 2^21892695497 is an apocalyptic number.

It is an amenable number.

21892695497 is a deficient number, since it is larger than the sum of its proper divisors (1).

21892695497 is an equidigital number, since it uses as much as digits as its factorization.

21892695497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 62.

The spelling of 21892695497 in words is "twenty-one billion, eight hundred ninety-two million, six hundred ninety-five thousand, four hundred ninety-seven".