121554402564 has 96 divisors (see below), whose sum is σ = 329876442112. Its totient is φ = 34117200000.

The previous prime is 121554402521. The next prime is 121554402583. The reversal of 121554402564 is 465204455121.

121554402564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4140939 + ... + 4170189.

Almost surely, 2^121554402564 is an apocalyptic number.

121554402564 is a gapful number since it is divisible by the number (14) 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 121554402564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164938221056).

121554402564 is an abundant number, since it is smaller than the sum of its proper divisors (208322039548).

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

121554402564 is a wasteful number, since it uses less digits than its factorization.

121554402564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30137 (or 30135 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 39.

Adding to 121554402564 its reverse (465204455121), we get a palindrome (586758857685).

The spelling of 121554402564 in words is "one hundred twenty-one billion, five hundred fifty-four million, four hundred two thousand, five hundred sixty-four".