121390126499 has 4 divisors (see below), whose sum is σ = 125575992960. Its totient is φ = 117204260040.

The previous prime is 121390126469. The next prime is 121390126531. The reversal of 121390126499 is 994621093121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121390126499 - 2³⁶ = 52670649763 is a prime.

It is a super-2 number, since 2×121390126499² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121390126439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2092933187 + ... + 2092933244.

It is an arithmetic number, because the mean of its divisors is an integer number (31393998240).

Almost surely, 2^121390126499 is an apocalyptic number.

121390126499 is a deficient number, since it is larger than the sum of its proper divisors (4185866461).

121390126499 is an equidigital number, since it uses as much as digits as its factorization.

121390126499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185866460.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 121390126499 in words is "one hundred twenty-one billion, three hundred ninety million, one hundred twenty-six thousand, four hundred ninety-nine".