21553400154112 has 96 divisors (see below), whose sum is σ = 43502167800000. Its totient is φ = 10675676233728.

The previous prime is 21553400154089. The next prime is 21553400154127. The reversal of 21553400154112 is 21145100435512.

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, 93213939 + ... + 93444877.

It is an arithmetic number, because the mean of its divisors is an integer number (453147581250).

Almost surely, 2^{21553400154112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21553400154112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21751083900000).

21553400154112 is an abundant number, since it is smaller than the sum of its proper divisors (21948767645888).

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

21553400154112 is a wasteful number, since it uses less digits than its factorization.

21553400154112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231389 (or 231369 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 21553400154112 its reverse (21145100435512), we get a palindrome (42698500589624).

The spelling of 21553400154112 in words is "twenty-one trillion, five hundred fifty-three billion, four hundred million, one hundred fifty-four thousand, one hundred twelve".