121643764460 has 24 divisors (see below), whose sum is σ = 255483241776. Its totient is φ = 48651536960.

The previous prime is 121643764423. The next prime is 121643764471. The reversal of 121643764460 is 64467346121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204071 + ... + 533790.

It is an arithmetic number, because the mean of its divisors is an integer number (10645135074).

Almost surely, 2^121643764460 is an apocalyptic number.

121643764460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121643764460 is an abundant number, since it is smaller than the sum of its proper divisors (133839477316).

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

121643764460 is a wasteful number, since it uses less digits than its factorization.

121643764460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746113 (or 746111 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 121643764460 in words is "one hundred twenty-one billion, six hundred forty-three million, seven hundred sixty-four thousand, four hundred sixty".