21471734 has 4 divisors (see below), whose sum is σ = 32207604. Its totient is φ = 10735866.

The previous prime is 21471733. The next prime is 21471739. The reversal of 21471734 is 43717412.

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

It is a super-2 number, since 2×21471734² = 922070721933512, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21471697 and 21471706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5367932 + ... + 5367935.

It is an arithmetic number, because the mean of its divisors is an integer number (8051901).

Almost surely, 2^21471734 is an apocalyptic number.

21471734 is a deficient number, since it is larger than the sum of its proper divisors (10735870).

21471734 is a wasteful number, since it uses less digits than its factorization.

21471734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10735869.

The product of its digits is 4704, while the sum is 29.

The square root of 21471734 is about 4633.7602441214. The cubic root of 21471734 is about 277.9429777979.

The spelling of 21471734 in words is "twenty-one million, four hundred seventy-one thousand, seven hundred thirty-four".