21134442 has 32 divisors (see below), whose sum is σ = 48673152. Its totient is φ = 5992704.

The previous prime is 21134431. The next prime is 21134453. The reversal of 21134442 is 24443112.

It is an interprime number because it is at equal distance from previous prime (21134431) and next prime (21134453).

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 3918 + ... + 7590.

It is an arithmetic number, because the mean of its divisors is an integer number (1521036).

Almost surely, 2^21134442 is an apocalyptic number.

21134442 is an abundant number, since it is smaller than the sum of its proper divisors (27538710).

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

21134442 is a wasteful number, since it uses less digits than its factorization.

21134442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822.

The product of its digits is 768, while the sum is 21.

The square root of 21134442 is about 4597.2211171533. The cubic root of 21134442 is about 276.4799201050.

Adding to 21134442 its reverse (24443112), we get a palindrome (45577554).

It can be divided in two parts, 2113 and 4442, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 21134442 in words is "twenty-one million, one hundred thirty-four thousand, four hundred forty-two".