121609494040 has 32 divisors (see below), whose sum is σ = 277369606080. Its totient is φ = 47977443072.

The previous prime is 121609494037. The next prime is 121609494073. The reversal of 121609494040 is 40494906121.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 121609493984 and 121609494002.

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, 20820624 + ... + 20826463.

It is an arithmetic number, because the mean of its divisors is an integer number (8667800190).

Almost surely, 2^121609494040 is an apocalyptic number.

121609494040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121609494040 is an abundant number, since it is smaller than the sum of its proper divisors (155760112040).

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

121609494040 is a wasteful number, since it uses less digits than its factorization.

121609494040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41647171 (or 41647167 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 121609494040 in words is "one hundred twenty-one billion, six hundred nine million, four hundred ninety-four thousand, forty".