21211010120137 has 2 divisors, whose sum is σ = 21211010120138. Its totient is φ = 21211010120136.

The previous prime is 21211010120093. The next prime is 21211010120141. The reversal of 21211010120137 is 73102101011212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13162463816121 + 8048546304016 = 3628011^2 + 2836996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211010120137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211010120177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605505060068 + 10605505060069.

It is an arithmetic number, because the mean of its divisors is an integer number (10605505060069).

Almost surely, 2^{21211010120137} is an apocalyptic number.

It is an amenable number.

21211010120137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211010120137 is an equidigital number, since it uses as much as digits as its factorization.

21211010120137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 21211010120137 its reverse (73102101011212), we get a palindrome (94313111131349).

The spelling of 21211010120137 in words is "twenty-one trillion, two hundred eleven billion, ten million, one hundred twenty thousand, one hundred thirty-seven".