121210221320831 has 2 divisors, whose sum is σ = 121210221320832. Its totient is φ = 121210221320830.

The previous prime is 121210221320827. The next prime is 121210221320911. The reversal of 121210221320831 is 138023122012121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121210221320831 - 2² = 121210221320827 is a prime.

It is a super-2 number, since 2×121210221320831² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121210221320794 and 121210221320803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210221320821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605110660415 + 60605110660416.

It is an arithmetic number, because the mean of its divisors is an integer number (60605110660416).

Almost surely, 2^{121210221320831} is an apocalyptic number.

121210221320831 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210221320831 is an equidigital number, since it uses as much as digits as its factorization.

121210221320831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

Adding to 121210221320831 its reverse (138023122012121), we get a palindrome (259233343332952).

The spelling of 121210221320831 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twenty-one million, three hundred twenty thousand, eight hundred thirty-one".