21735694 has 4 divisors (see below), whose sum is σ = 32603544. Its totient is φ = 10867846.

The previous prime is 21735691. The next prime is 21735697. The reversal of 21735694 is 49653712.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21735691) and next prime (21735697).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21735691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5433922 + ... + 5433925.

It is an arithmetic number, because the mean of its divisors is an integer number (8150886).

Almost surely, 2^21735694 is an apocalyptic number.

21735694 is a deficient number, since it is larger than the sum of its proper divisors (10867850).

21735694 is a wasteful number, since it uses less digits than its factorization.

21735694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10867849.

The product of its digits is 45360, while the sum is 37.

The square root of 21735694 is about 4662.1555100618. The cubic root of 21735694 is about 279.0772943092.

The spelling of 21735694 in words is "twenty-one million, seven hundred thirty-five thousand, six hundred ninety-four".