121214777550 has 24 divisors (see below), whose sum is σ = 300612648696. Its totient is φ = 32323940640.

The previous prime is 121214777533. The next prime is 121214777597. The reversal of 121214777550 is 55777412121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404049109 + ... + 404049408.

It is an arithmetic number, because the mean of its divisors is an integer number (12525527029).

Almost surely, 2^121214777550 is an apocalyptic number.

121214777550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121214777550 is an abundant number, since it is smaller than the sum of its proper divisors (179397871146).

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

121214777550 is a wasteful number, since it uses less digits than its factorization.

121214777550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808098532 (or 808098527 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 42.

The spelling of 121214777550 in words is "one hundred twenty-one billion, two hundred fourteen million, seven hundred seventy-seven thousand, five hundred fifty".