121751553640 has 32 divisors (see below), whose sum is σ = 280311720480. Its totient is φ = 47568048192.

The previous prime is 121751553631. The next prime is 121751553667. The reversal of 121751553640 is 46355157121.

It is a happy number.

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 = 121751553593 and 121751553602.

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, 35391174 + ... + 35394613.

It is an arithmetic number, because the mean of its divisors is an integer number (8759741265).

Almost surely, 2^121751553640 is an apocalyptic number.

121751553640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121751553640 is an abundant number, since it is smaller than the sum of its proper divisors (158560166840).

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

121751553640 is a wasteful number, since it uses less digits than its factorization.

121751553640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70785841 (or 70785837 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 121751553640 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred fifty-three thousand, six hundred forty".