121761607420 has 24 divisors (see below), whose sum is σ = 255744813744. Its totient is φ = 48695988096.

The previous prime is 121761607379. The next prime is 121761607439. The reversal of 121761607420 is 24706167121.

It is a self number, because there is not a number n which added to its sum of digits gives 121761607420.

It is a congruent number.

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, 424962 + ... + 651241.

It is an arithmetic number, because the mean of its divisors is an integer number (10656033906).

Almost surely, 2^121761607420 is an apocalyptic number.

121761607420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121761607420 is an abundant number, since it is smaller than the sum of its proper divisors (133983206324).

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

121761607420 is a wasteful number, since it uses less digits than its factorization.

121761607420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081869 (or 1081867 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 121761607420 in words is "one hundred twenty-one billion, seven hundred sixty-one million, six hundred seven thousand, four hundred twenty".