21694734 has 24 divisors (see below), whose sum is σ = 47709480. Its totient is φ = 7123248.

The previous prime is 21694723. The next prime is 21694741. The reversal of 21694734 is 43749612.

It is a super-2 number, since 2×21694734² = 941322966661512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7789 + ... + 10200.

It is an arithmetic number, because the mean of its divisors is an integer number (1987895).

Almost surely, 2^21694734 is an apocalyptic number.

21694734 is an abundant number, since it is smaller than the sum of its proper divisors (26014746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21694734 is a wasteful number, since it uses less digits than its factorization.

21694734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18064 (or 18061 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21694734 is about 4657.7606207275. The cubic root of 21694734 is about 278.9018809404.

It can be divided in two parts, 2169 and 4734, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 21694734 in words is "twenty-one million, six hundred ninety-four thousand, seven hundred thirty-four".