121154420731 has 2 divisors, whose sum is σ = 121154420732. Its totient is φ = 121154420730.

The previous prime is 121154420687. The next prime is 121154420743. The reversal of 121154420731 is 137024451121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121154420731 - 2³¹ = 119006937083 is a prime.

It is a super-2 number, since 2×121154420731² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121154420693 and 121154420702.

It is not a weakly prime, because it can be changed into another prime (121154420771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60577210365 + 60577210366.

It is an arithmetic number, because the mean of its divisors is an integer number (60577210366).

Almost surely, 2^121154420731 is an apocalyptic number.

121154420731 is a deficient number, since it is larger than the sum of its proper divisors (1).

121154420731 is an equidigital number, since it uses as much as digits as its factorization.

121154420731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

Adding to 121154420731 its reverse (137024451121), we get a palindrome (258178871852).

The spelling of 121154420731 in words is "one hundred twenty-one billion, one hundred fifty-four million, four hundred twenty thousand, seven hundred thirty-one".