20167221 has 8 divisors (see below), whose sum is σ = 26952640. Its totient is φ = 13413312.

The previous prime is 20167211. The next prime is 20167229. The reversal of 20167221 is 12276102.

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

It is not a de Polignac number, because 20167221 - 2²¹ = 18070069 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 (20167229) 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, 6340 + ... + 8973.

It is an arithmetic number, because the mean of its divisors is an integer number (3369080).

Almost surely, 2^20167221 is an apocalyptic number.

It is an amenable number.

20167221 is a deficient number, since it is larger than the sum of its proper divisors (6785419).

20167221 is a wasteful number, since it uses less digits than its factorization.

20167221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15755.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20167221 is about 4490.7929143972. The cubic root of 20167221 is about 272.1961756991.

The spelling of 20167221 in words is "twenty million, one hundred sixty-seven thousand, two hundred twenty-one".