21613142 has 4 divisors (see below), whose sum is σ = 32419716. Its totient is φ = 10806570.

The previous prime is 21613139. The next prime is 21613153. The reversal of 21613142 is 24131612.

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

It is a super-2 number, since 2×21613142² = 934255814224328, which contains 22 as substring.

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, 5403284 + ... + 5403287.

It is an arithmetic number, because the mean of its divisors is an integer number (8104929).

Almost surely, 2^21613142 is an apocalyptic number.

21613142 is a deficient number, since it is larger than the sum of its proper divisors (10806574).

21613142 is a wasteful number, since it uses less digits than its factorization.

21613142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806573.

The product of its digits is 288, while the sum is 20.

The square root of 21613142 is about 4648.9936545450. The cubic root of 21613142 is about 278.5517998254.

Adding to 21613142 its reverse (24131612), we get a palindrome (45744754).

The spelling of 21613142 in words is "twenty-one million, six hundred thirteen thousand, one hundred forty-two".