3211620721697 has 4 divisors (see below), whose sum is σ = 3380653391280. Its totient is φ = 3042588052116.

The previous prime is 3211620721651. The next prime is 3211620721721. The reversal of 3211620721697 is 7961270261123.

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 a cyclic number.

It is not a de Polignac number, because 3211620721697 - 2¹² = 3211620717601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3211620721607) 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, 84516334763 + ... + 84516334800.

It is an arithmetic number, because the mean of its divisors is an integer number (845163347820).

Almost surely, 2^{3211620721697} is an apocalyptic number.

It is an amenable number.

3211620721697 is a deficient number, since it is larger than the sum of its proper divisors (169032669583).

3211620721697 is a wasteful number, since it uses less digits than its factorization.

3211620721697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169032669582.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 3211620721697 in words is "three trillion, two hundred eleven billion, six hundred twenty million, seven hundred twenty-one thousand, six hundred ninety-seven".