21376029497 has 2 divisors, whose sum is σ = 21376029498. Its totient is φ = 21376029496.

The previous prime is 21376029481. The next prime is 21376029527. The reversal of 21376029497 is 79492067312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15406767376 + 5969262121 = 124124^2 + 77261^2 .

It is a cyclic number.

It is not a de Polignac number, because 21376029497 - 2⁴ = 21376029481 is a prime.

It is a super-2 number, since 2×21376029497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21376029197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688014748 + 10688014749.

It is an arithmetic number, because the mean of its divisors is an integer number (10688014749).

Almost surely, 2^21376029497 is an apocalyptic number.

It is an amenable number.

21376029497 is a deficient number, since it is larger than the sum of its proper divisors (1).

21376029497 is an equidigital number, since it uses as much as digits as its factorization.

21376029497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The spelling of 21376029497 in words is "twenty-one billion, three hundred seventy-six million, twenty-nine thousand, four hundred ninety-seven".