21752142 has 32 divisors (see below), whose sum is σ = 45480960. Its totient is φ = 6927360.

The previous prime is 21752141. The next prime is 21752177. The reversal of 21752142 is 24125712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21752141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14734 + ... + 16142.

It is an arithmetic number, because the mean of its divisors is an integer number (1421280).

Almost surely, 2^21752142 is an apocalyptic number.

21752142 is an abundant number, since it is smaller than the sum of its proper divisors (23728818).

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

21752142 is a wasteful number, since it uses less digits than its factorization.

21752142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528.

The product of its digits is 1120, while the sum is 24.

The square root of 21752142 is about 4663.9191673956. The cubic root of 21752142 is about 279.1476717256.

Adding to 21752142 its reverse (24125712), we get a palindrome (45877854).

The spelling of 21752142 in words is "twenty-one million, seven hundred fifty-two thousand, one hundred forty-two".