1397400415221 has 4 divisors (see below), whose sum is σ = 1863200553632. Its totient is φ = 931600276812.

The previous prime is 1397400415217. The next prime is 1397400415249. The reversal of 1397400415221 is 1225140047931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1397400415221 - 2² = 1397400415217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1397400415221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397400415291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232900069201 + ... + 232900069206.

It is an arithmetic number, because the mean of its divisors is an integer number (465800138408).

Almost surely, 2^{1397400415221} is an apocalyptic number.

It is an amenable number.

1397400415221 is a deficient number, since it is larger than the sum of its proper divisors (465800138411).

1397400415221 is an equidigital number, since it uses as much as digits as its factorization.

1397400415221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465800138410.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 1397400415221 in words is "one trillion, three hundred ninety-seven billion, four hundred million, four hundred fifteen thousand, two hundred twenty-one".