21346897 has 12 divisors (see below), whose sum is σ = 25218864. Its totient is φ = 17911920.

The previous prime is 21346873. The next prime is 21346903. The reversal of 21346897 is 79864312.

It is not a de Polignac number, because 21346897 - 2²³ = 12958289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21346837) 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, 3883 + ... + 7600.

It is an arithmetic number, because the mean of its divisors is an integer number (2101572).

Almost surely, 2^21346897 is an apocalyptic number.

It is an amenable number.

21346897 is a deficient number, since it is larger than the sum of its proper divisors (3871967).

21346897 is a wasteful number, since it uses less digits than its factorization.

21346897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520 (or 11507 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 21346897 is about 4620.2702301922. The cubic root of 21346897 is about 277.4032755452.

The spelling of 21346897 in words is "twenty-one million, three hundred forty-six thousand, eight hundred ninety-seven".