21231134 has 4 divisors (see below), whose sum is σ = 31846704. Its totient is φ = 10615566.

The previous prime is 21231107. The next prime is 21231143. The reversal of 21231134 is 43113212.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21231134² = 901522101851912, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307782 + ... + 5307785.

It is an arithmetic number, because the mean of its divisors is an integer number (7961676).

Almost surely, 2^21231134 is an apocalyptic number.

21231134 is a deficient number, since it is larger than the sum of its proper divisors (10615570).

21231134 is a wasteful number, since it uses less digits than its factorization.

21231134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615569.

The product of its digits is 144, while the sum is 17.

The square root of 21231134 is about 4607.7254692527. The cubic root of 21231134 is about 276.9009190050.

Adding to 21231134 its reverse (43113212), we get a palindrome (64344346).

The spelling of 21231134 in words is "twenty-one million, two hundred thirty-one thousand, one hundred thirty-four".