21151314 has 16 divisors (see below), whose sum is σ = 47003040. Its totient is φ = 7050420.

The previous prime is 21151307. The next prime is 21151343. The reversal of 21151314 is 41315112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195792 + ... + 195899.

It is an arithmetic number, because the mean of its divisors is an integer number (2937690).

Almost surely, 2^21151314 is an apocalyptic number.

21151314 is an abundant number, since it is smaller than the sum of its proper divisors (25851726).

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

21151314 is a wasteful number, since it uses less digits than its factorization.

21151314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391702 (or 391696 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 21151314 is about 4599.0557726559. The cubic root of 21151314 is about 276.5534734773.

Adding to 21151314 its reverse (41315112), we get a palindrome (62466426).

The spelling of 21151314 in words is "twenty-one million, one hundred fifty-one thousand, three hundred fourteen".