1397527911221 has 8 divisors (see below), whose sum is σ = 1505039239704. Its totient is φ = 1290017894400.

The previous prime is 1397527911217. The next prime is 1397527911239. The reversal of 1397527911221 is 1221197257931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 557575824100 + 839952087121 = 746710^2 + 916489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1397527911221 - 2² = 1397527911217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1397527911221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397527911211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4035305 + ... + 4367921.

It is an arithmetic number, because the mean of its divisors is an integer number (188129904963).

Almost surely, 2^{1397527911221} is an apocalyptic number.

It is an amenable number.

1397527911221 is a deficient number, since it is larger than the sum of its proper divisors (107511328483).

1397527911221 is a wasteful number, since it uses less digits than its factorization.

1397527911221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655831.

The product of its digits is 476280, while the sum is 50.

The spelling of 1397527911221 in words is "one trillion, three hundred ninety-seven billion, five hundred twenty-seven million, nine hundred eleven thousand, two hundred twenty-one".