121571901440 has 368 divisors, whose sum is σ = 347892309504. Its totient is φ = 40265318400.

The previous prime is 121571901431. The next prime is 121571901467. The reversal of 121571901440 is 44109175121.

It is a self number, because there is not a number n which added to its sum of digits gives 121571901440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3921674225 + ... + 3921674255.

Almost surely, 2^121571901440 is an apocalyptic number.

121571901440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121571901440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173946154752).

121571901440 is an abundant number, since it is smaller than the sum of its proper divisors (226320408064).

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

121571901440 is an frugal number, since it uses more digits than its factorization.

121571901440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The spelling of 121571901440 in words is "one hundred twenty-one billion, five hundred seventy-one million, nine hundred one thousand, four hundred forty".