21434312 has 8 divisors (see below), whose sum is σ = 40189350. Its totient is φ = 10717152.

The previous prime is 21434293. The next prime is 21434323. The reversal of 21434312 is 21343412.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 329476 = 4594^2 + 574^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339637 + ... + 1339652.

Almost surely, 2^21434312 is an apocalyptic number.

It is an amenable number.

21434312 is a deficient number, since it is larger than the sum of its proper divisors (18755038).

21434312 is a wasteful number, since it uses less digits than its factorization.

21434312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679295 (or 2679291 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 21434312 is about 4629.7205099228. The cubic root of 21434312 is about 277.7814129776.

Adding to 21434312 its reverse (21343412), we get a palindrome (42777724).

The spelling of 21434312 in words is "twenty-one million, four hundred thirty-four thousand, three hundred twelve".