21342867 has 16 divisors (see below), whose sum is σ = 35024640. Its totient is φ = 11257632.

The previous prime is 21342857. The next prime is 21342883. The reversal of 21342867 is 76824312.

It is not a de Polignac number, because 21342867 - 2⁴ = 21342851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21342817) 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, 38817 + ... + 39362.

It is an arithmetic number, because the mean of its divisors is an integer number (2189040).

Almost surely, 2^21342867 is an apocalyptic number.

21342867 is a deficient number, since it is larger than the sum of its proper divisors (13681773).

21342867 is a wasteful number, since it uses less digits than its factorization.

21342867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78202.

The product of its digits is 16128, while the sum is 33.

The square root of 21342867 is about 4619.8340879300. The cubic root of 21342867 is about 277.3858178079.

The spelling of 21342867 in words is "twenty-one million, three hundred forty-two thousand, eight hundred sixty-seven".