21346691 has 8 divisors (see below), whose sum is σ = 22819104. Its totient is φ = 19919680.

The previous prime is 21346681. The next prime is 21346711. The reversal of 21346691 is 19664312.

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

It is a cyclic number.

It is not a de Polignac number, because 21346691 - 2⁶ = 21346627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21346621) 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, 10376 + ... + 12261.

It is an arithmetic number, because the mean of its divisors is an integer number (2852388).

Almost surely, 2^21346691 is an apocalyptic number.

21346691 is a deficient number, since it is larger than the sum of its proper divisors (1472413).

21346691 is a wasteful number, since it uses less digits than its factorization.

21346691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22701.

The product of its digits is 7776, while the sum is 32.

The square root of 21346691 is about 4620.2479370700. The cubic root of 21346691 is about 277.4023832178.

The spelling of 21346691 in words is "twenty-one million, three hundred forty-six thousand, six hundred ninety-one".