6967491221 has 4 divisors (see below), whose sum is σ = 6974580192. Its totient is φ = 6960402252.

The previous prime is 6967491217. The next prime is 6967491227. The reversal of 6967491221 is 1221947696.

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 6967491221 - 2² = 6967491217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6967491227) 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, 3543011 + ... + 3544976.

It is an arithmetic number, because the mean of its divisors is an integer number (1743645048).

Almost surely, 2^6967491221 is an apocalyptic number.

It is an amenable number.

6967491221 is a deficient number, since it is larger than the sum of its proper divisors (7088971).

6967491221 is an equidigital number, since it uses as much as digits as its factorization.

6967491221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088970.

The product of its digits is 326592, while the sum is 47.

The square root of 6967491221 is about 83471.4994534063. The cubic root of 6967491221 is about 1909.9652982923.

The spelling of 6967491221 in words is "six billion, nine hundred sixty-seven million, four hundred ninety-one thousand, two hundred twenty-one".