1256211201400 has 96 divisors (see below), whose sum is σ = 2955601342800. Its totient is φ = 496486425600.

The previous prime is 1256211201397. The next prime is 1256211201499. The reversal of 1256211201400 is 41021126521.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25839115 + ... + 25887685.

Almost surely, 2^{1256211201400} is an apocalyptic number.

1256211201400 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 1256211201400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477800671400).

1256211201400 is an abundant number, since it is smaller than the sum of its proper divisors (1699390141400).

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

1256211201400 is a wasteful number, since it uses less digits than its factorization.

1256211201400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50129 (or 50120 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 1256211201400 its reverse (41021126521), we get a palindrome (1297232327921).

The spelling of 1256211201400 in words is "one trillion, two hundred fifty-six billion, two hundred eleven million, two hundred one thousand, four hundred".