121530779898 has 16 divisors (see below), whose sum is σ = 265158065376. Its totient is φ = 36827509040.

The previous prime is 121530779897. The next prime is 121530779911. The reversal of 121530779898 is 898977035121.

It is a super-2 number, since 2×121530779898² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121530779897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920687661 + ... + 920687792.

It is an arithmetic number, because the mean of its divisors is an integer number (16572379086).

Almost surely, 2^121530779898 is an apocalyptic number.

121530779898 is an abundant number, since it is smaller than the sum of its proper divisors (143627285478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121530779898 is a wasteful number, since it uses less digits than its factorization.

121530779898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841375469.

The product of its (nonzero) digits is 7620480, while the sum is 60.

The spelling of 121530779898 in words is "one hundred twenty-one billion, five hundred thirty million, seven hundred seventy-nine thousand, eight hundred ninety-eight".