21120211220231 has 2 divisors, whose sum is σ = 21120211220232. Its totient is φ = 21120211220230.

The previous prime is 21120211220209. The next prime is 21120211220239. The reversal of 21120211220231 is 13202211202112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120211220231 - 2³⁰ = 21119137478407 is a prime.

It is a super-2 number, since 2×21120211220231² (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 (21120211220239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560105610115 + 10560105610116.

It is an arithmetic number, because the mean of its divisors is an integer number (10560105610116).

Almost surely, 2^{21120211220231} is an apocalyptic number.

21120211220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120211220231 is an equidigital number, since it uses as much as digits as its factorization.

21120211220231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21120211220231 its reverse (13202211202112), we get a palindrome (34322422422343).

The spelling of 21120211220231 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty thousand, two hundred thirty-one".