21734312 has 8 divisors (see below), whose sum is σ = 40751850. Its totient is φ = 10867152.

The previous prime is 21734303. The next prime is 21734327. The reversal of 21734312 is 21343712.

It can be written as a sum of positive squares in only one way, i.e., 21585316 + 148996 = 4646^2 + 386^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21734312² = 944760636226688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1358387 + ... + 1358402.

Almost surely, 2^21734312 is an apocalyptic number.

It is an amenable number.

21734312 is a deficient number, since it is larger than the sum of its proper divisors (19017538).

21734312 is a wasteful number, since it uses less digits than its factorization.

21734312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716795 (or 2716791 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 21734312 is about 4662.0072930016. The cubic root of 21734312 is about 279.0713794149.

The spelling of 21734312 in words is "twenty-one million, seven hundred thirty-four thousand, three hundred twelve".