21292693 has 8 divisors (see below), whose sum is σ = 21565440. Its totient is φ = 21021840.

The previous prime is 21292681. The next prime is 21292717. The reversal of 21292693 is 39629212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21292693 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 (21292613) 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, 49188 + ... + 49618.

It is an arithmetic number, because the mean of its divisors is an integer number (2695680).

Almost surely, 2^21292693 is an apocalyptic number.

It is an amenable number.

21292693 is a deficient number, since it is larger than the sum of its proper divisors (272747).

21292693 is a wasteful number, since it uses less digits than its factorization.

21292693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947.

The product of its digits is 11664, while the sum is 34.

The square root of 21292693 is about 4614.4006111303. The cubic root of 21292693 is about 277.1682825795.

The spelling of 21292693 in words is "twenty-one million, two hundred ninety-two thousand, six hundred ninety-three".