21139099297 has 2 divisors, whose sum is σ = 21139099298. Its totient is φ = 21139099296.

The previous prime is 21139099291. The next prime is 21139099351. The reversal of 21139099297 is 79299093112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18989942416 + 2149156881 = 137804^2 + 46359^2 .

It is a cyclic number.

It is not a de Polignac number, because 21139099297 - 2¹⁹ = 21138575009 is a prime.

It is a super-3 number, since 3×21139099297³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21139099291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10569549648 + 10569549649.

It is an arithmetic number, because the mean of its divisors is an integer number (10569549649).

Almost surely, 2^21139099297 is an apocalyptic number.

It is an amenable number.

21139099297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21139099297 is an equidigital number, since it uses as much as digits as its factorization.

21139099297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 52.

The spelling of 21139099297 in words is "twenty-one billion, one hundred thirty-nine million, ninety-nine thousand, two hundred ninety-seven".