121621747456 has 288 divisors, whose sum is σ = 282449534976. Its totient is φ = 51757056000.

The previous prime is 121621747453. The next prime is 121621747459. The reversal of 121621747456 is 654747126121.

It is an interprime number because it is at equal distance from previous prime (121621747453) and next prime (121621747459).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121621747453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 448788601 + ... + 448788871.

It is an arithmetic number, because the mean of its divisors is an integer number (980727552).

Almost surely, 2^121621747456 is an apocalyptic number.

121621747456 is a gapful number since it is divisible by the number (16) 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 121621747456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141224767488).

121621747456 is an abundant number, since it is smaller than the sum of its proper divisors (160827787520).

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

121621747456 is a wasteful number, since it uses less digits than its factorization.

121621747456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 465 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The spelling of 121621747456 in words is "one hundred twenty-one billion, six hundred twenty-one million, seven hundred forty-seven thousand, four hundred fifty-six".