21310539948029 has 2 divisors, whose sum is σ = 21310539948030. Its totient is φ = 21310539948028.

The previous prime is 21310539948011. The next prime is 21310539948043. The reversal of 21310539948029 is 92084993501312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15263008104100 + 6047531843929 = 3906790^2 + 2459173^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310539948029 - 2²⁴ = 21310523170813 is a prime.

It is a super-2 number, since 2×21310539948029² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310539948629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655269974014 + 10655269974015.

It is an arithmetic number, because the mean of its divisors is an integer number (10655269974015).

Almost surely, 2^{21310539948029} is an apocalyptic number.

It is an amenable number.

21310539948029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310539948029 is an equidigital number, since it uses as much as digits as its factorization.

21310539948029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 21310539948029 in words is "twenty-one trillion, three hundred ten billion, five hundred thirty-nine million, nine hundred forty-eight thousand, twenty-nine".