21120202121231 has 2 divisors, whose sum is σ = 21120202121232. Its totient is φ = 21120202121230.

The previous prime is 21120202121219. The next prime is 21120202121273. The reversal of 21120202121231 is 13212120202112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120202121231 - 2¹⁰ = 21120202120207 is a prime.

It is a super-2 number, since 2×21120202121231² (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 (21120202121731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560101060615 + 10560101060616.

It is an arithmetic number, because the mean of its divisors is an integer number (10560101060616).

Almost surely, 2^{21120202121231} is an apocalyptic number.

21120202121231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120202121231 is an equidigital number, since it uses as much as digits as its factorization.

21120202121231 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 21120202121231 its reverse (13212120202112), we get a palindrome (34332322323343).

The spelling of 21120202121231 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, one hundred twenty-one thousand, two hundred thirty-one".