3897346678221 has 4 divisors (see below), whose sum is σ = 5196462237632. Its totient is φ = 2598231118812.

The previous prime is 3897346678189. The next prime is 3897346678231. The reversal of 3897346678221 is 1228766437983.

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 3897346678221 - 2⁵ = 3897346678189 is a prime.

It is a super-2 number, since 2×3897346678221² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897346678231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649557779701 + ... + 649557779706.

It is an arithmetic number, because the mean of its divisors is an integer number (1299115559408).

Almost surely, 2^{3897346678221} is an apocalyptic number.

It is an amenable number.

3897346678221 is a deficient number, since it is larger than the sum of its proper divisors (1299115559411).

3897346678221 is a wasteful number, since it uses less digits than its factorization.

3897346678221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299115559410.

The product of its digits is 146313216, while the sum is 66.

The spelling of 3897346678221 in words is "three trillion, eight hundred ninety-seven billion, three hundred forty-six million, six hundred seventy-eight thousand, two hundred twenty-one".