21426167 has 16 divisors (see below), whose sum is σ = 26150400. Its totient is φ = 17146080.

The previous prime is 21426161. The next prime is 21426173. The reversal of 21426167 is 76162412.

It is an interprime number because it is at equal distance from previous prime (21426161) and next prime (21426173).

It is a de Polignac number, because none of the positive numbers 2^k-21426167 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 (21426161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8309 + ... + 10577.

It is an arithmetic number, because the mean of its divisors is an integer number (1634400).

Almost surely, 2^21426167 is an apocalyptic number.

21426167 is a deficient number, since it is larger than the sum of its proper divisors (4724233).

21426167 is a wasteful number, since it uses less digits than its factorization.

21426167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366.

The product of its digits is 4032, while the sum is 29.

The square root of 21426167 is about 4628.8407836088. The cubic root of 21426167 is about 277.7462230408.

Adding to 21426167 its reverse (76162412), we get a palindrome (97588579).

The spelling of 21426167 in words is "twenty-one million, four hundred twenty-six thousand, one hundred sixty-seven".