21113142 has 32 divisors (see below), whose sum is σ = 44755200. Its totient is φ = 6621408.

The previous prime is 21113119. The next prime is 21113153. The reversal of 21113142 is 24131112.

It is a super-2 number, since 2×21113142² = 891529530224328, 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 in 15 ways as a sum of consecutive naturals, for example, 18484 + ... + 19592.

It is an arithmetic number, because the mean of its divisors is an integer number (1398600).

Almost surely, 2^21113142 is an apocalyptic number.

21113142 is an abundant number, since it is smaller than the sum of its proper divisors (23642058).

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

21113142 is a wasteful number, since it uses less digits than its factorization.

21113142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

The product of its digits is 48, while the sum is 15.

The square root of 21113142 is about 4594.9039162968. The cubic root of 21113142 is about 276.3870069700.

Adding to 21113142 its reverse (24131112), we get a palindrome (45244254).

It can be divided in two parts, 2111 and 3142, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 21113142 in words is "twenty-one million, one hundred thirteen thousand, one hundred forty-two".