21351114 has 20 divisors (see below), whose sum is σ = 47842674. Its totient is φ = 7116984.

The previous prime is 21351073. The next prime is 21351131. The reversal of 21351114 is 41115312.

21351114 = 167² + 168² + ... + 409².

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 7535025 = 3717^2 + 2745^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65737 + ... + 66060.

Almost surely, 2^21351114 is an apocalyptic number.

21351114 is an abundant number, since it is smaller than the sum of its proper divisors (26491560).

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

21351114 is a wasteful number, since it uses less digits than its factorization.

21351114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131811 (or 131802 counting only the distinct ones).

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

The square root of 21351114 is about 4620.7265662448. The cubic root of 21351114 is about 277.4215410038.

Adding to 21351114 its reverse (41115312), we get a palindrome (62466426).

It can be divided in two parts, 2135 and 1114, that added together give a square (3249 = 57²).

The spelling of 21351114 in words is "twenty-one million, three hundred fifty-one thousand, one hundred fourteen".