21142532 has 24 divisors (see below), whose sum is σ = 38041920. Its totient is φ = 10277600.

The previous prime is 21142531. The next prime is 21142613. The reversal of 21142532 is 23524112.

It is not an unprimeable number, because it can be changed into a prime (21142531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23393 + ... + 24279.

It is an arithmetic number, because the mean of its divisors is an integer number (1585080).

Almost surely, 2^21142532 is an apocalyptic number.

It is an amenable number.

21142532 is a deficient number, since it is larger than the sum of its proper divisors (16899388).

21142532 is a wasteful number, since it uses less digits than its factorization.

21142532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051 (or 1049 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21142532 is about 4598.1009123333. The cubic root of 21142532 is about 276.5151932896.

Adding to 21142532 its reverse (23524112), we get a palindrome (44666644).

The spelling of 21142532 in words is "twenty-one million, one hundred forty-two thousand, five hundred thirty-two".