1213251521200 has 120 divisors (see below), whose sum is σ = 2965534370240. Its totient is φ = 476875468800.

The previous prime is 1213251521173. The next prime is 1213251521201. The reversal of 1213251521200 is 21251523121.

It is a happy number.

It is a super-2 number, since 2×1213251521200² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1213251521201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25327672 + ... + 25375528.

Almost surely, 2^{1213251521200} is an apocalyptic number.

1213251521200 is a gapful number since it is divisible by the number (10) 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 1213251521200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1482767185120).

1213251521200 is an abundant number, since it is smaller than the sum of its proper divisors (1752282849040).

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

1213251521200 is a wasteful number, since it uses less digits than its factorization.

1213251521200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48975 (or 48964 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 1213251521200 in words is "one trillion, two hundred thirteen billion, two hundred fifty-one million, five hundred twenty-one thousand, two hundred".