7221667 has 12 divisors (see below), whose sum is σ = 7748416. Its totient is φ = 6723360.

The previous prime is 7221661. The next prime is 7221689. The reversal of 7221667 is 7661227.

It is a de Polignac number, because none of the positive numbers 2^k-7221667 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25933 + ... + 26209.

Almost surely, 2^7221667 is an apocalyptic number.

7221667 is a deficient number, since it is larger than the sum of its proper divisors (526749).

7221667 is a wasteful number, since it uses less digits than its factorization.

7221667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 337 counting only the distinct ones).

The product of its digits is 7056, while the sum is 31.

The square root of 7221667 is about 2687.3159471860. The cubic root of 7221667 is about 193.2913797856.

The spelling of 7221667 in words is "seven million, two hundred twenty-one thousand, six hundred sixty-seven".