121990927988 has 12 divisors (see below), whose sum is σ = 213496543680. Its totient is φ = 60991915512.

The previous prime is 121990927987. The next prime is 121990927991. The reversal of 121990927988 is 889729099121.

It is a super-2 number, since 2×121990927988² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (65) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121990927987) 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, 809006 + ... + 947877.

It is an arithmetic number, because the mean of its divisors is an integer number (17791378640).

Almost surely, 2^121990927988 is an apocalyptic number.

It is an amenable number.

121990927988 is a deficient number, since it is larger than the sum of its proper divisors (91505615692).

121990927988 is a wasteful number, since it uses less digits than its factorization.

121990927988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774246 (or 1774244 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 65.

The spelling of 121990927988 in words is "one hundred twenty-one billion, nine hundred ninety million, nine hundred twenty-seven thousand, nine hundred eighty-eight".