21411897 has 8 divisors (see below), whose sum is σ = 30745344. Its totient is φ = 13176528.

The previous prime is 21411883. The next prime is 21411911. The reversal of 21411897 is 79811412.

It is an interprime number because it is at equal distance from previous prime (21411883) and next prime (21411911).

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

It is not a de Polignac number, because 21411897 - 2⁶ = 21411833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411847) 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, 274473 + ... + 274550.

It is an arithmetic number, because the mean of its divisors is an integer number (3843168).

Almost surely, 2^21411897 is an apocalyptic number.

It is an amenable number.

21411897 is a deficient number, since it is larger than the sum of its proper divisors (9333447).

21411897 is a wasteful number, since it uses less digits than its factorization.

21411897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549039.

The product of its digits is 4032, while the sum is 33.

The square root of 21411897 is about 4627.2991042292. The cubic root of 21411897 is about 277.6845489389.

The spelling of 21411897 in words is "twenty-one million, four hundred eleven thousand, eight hundred ninety-seven".