21512314 has 12 divisors (see below), whose sum is σ = 33734106. Its totient is φ = 10287992.

The previous prime is 21512311. The next prime is 21512333. The reversal of 21512314 is 41321512.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 8803089 = 3565^2 + 2967^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21512291 and 21512300.

It is not an unprimeable number, because it can be changed into a prime (21512311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9109 + ... + 11224.

Almost surely, 2^21512314 is an apocalyptic number.

21512314 is a deficient number, since it is larger than the sum of its proper divisors (12221792).

21512314 is a wasteful number, since it uses less digits than its factorization.

21512314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20381 (or 20358 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 21512314 is about 4638.1369104415. The cubic root of 21512314 is about 278.1179648770.

Adding to 21512314 its reverse (41321512), we get a palindrome (62833826).

It can be divided in two parts, 2151 and 2314, that added together give a triangular number (4465 = T₉₄).

The spelling of 21512314 in words is "twenty-one million, five hundred twelve thousand, three hundred fourteen".