242121043991 has 2 divisors, whose sum is σ = 242121043992. Its totient is φ = 242121043990.

The previous prime is 242121043973. The next prime is 242121044003. The reversal of 242121043991 is 199340121242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242121043991 - 2²² = 242116849687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242121043921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121060521995 + 121060521996.

It is an arithmetic number, because the mean of its divisors is an integer number (121060521996).

Almost surely, 2^242121043991 is an apocalyptic number.

242121043991 is a deficient number, since it is larger than the sum of its proper divisors (1).

242121043991 is an equidigital number, since it uses as much as digits as its factorization.

242121043991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 242121043991 in words is "two hundred forty-two billion, one hundred twenty-one million, forty-three thousand, nine hundred ninety-one".