21161846274400 has 1152 divisors, whose sum is σ = 62105960964096. Its totient is φ = 6973533388800.

The previous prime is 21161846274343. The next prime is 21161846274449. The reversal of 21161846274400 is 447264816112.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 37587648519 + ... + 37587649081.

It is an arithmetic number, because the mean of its divisors is an integer number (53911424448).

Almost surely, 2^{21161846274400} is an apocalyptic number.

21161846274400 is a gapful number since it is divisible by the number (20) 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 21161846274400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31052980482048).

21161846274400 is an abundant number, since it is smaller than the sum of its proper divisors (40944114689696).

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

21161846274400 is a wasteful number, since it uses less digits than its factorization.

21161846274400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 21161846274400 in words is "twenty-one trillion, one hundred sixty-one billion, eight hundred forty-six million, two hundred seventy-four thousand, four hundred".