21125453052000 has 384 divisors, whose sum is σ = 75765441443328. Its totient is φ = 5103216384000.

The previous prime is 21125453051909. The next prime is 21125453052037. The reversal of 21125453052000 is 25035452112.

It is a super-2 number, since 2×21125453052000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37073242 + ... + 37638758.

It is an arithmetic number, because the mean of its divisors is an integer number (197305837092).

Almost surely, 2^{21125453052000} is an apocalyptic number.

21125453052000 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 21125453052000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37882720721664).

21125453052000 is an abundant number, since it is smaller than the sum of its proper divisors (54639988391328).

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

21125453052000 is a wasteful number, since it uses less digits than its factorization.

21125453052000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565839 (or 565821 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21125453052000 in words is "twenty-one trillion, one hundred twenty-five billion, four hundred fifty-three million, fifty-two thousand".