21023142 has 32 divisors (see below), whose sum is σ = 48432384. Its totient is φ = 5959200.

The previous prime is 21023137. The next prime is 21023143. The reversal of 21023142 is 24132012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023143) 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, 3592 + ... + 7412.

It is an arithmetic number, because the mean of its divisors is an integer number (1513512).

Almost surely, 2^21023142 is an apocalyptic number.

21023142 is an abundant number, since it is smaller than the sum of its proper divisors (27409242).

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

21023142 is a wasteful number, since it uses less digits than its factorization.

21023142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21023142 is about 4585.0999989095. The cubic root of 21023142 is about 275.9937249151.

Adding to 21023142 its reverse (24132012), we get a palindrome (45155154).

The spelling of 21023142 in words is "twenty-one million, twenty-three thousand, one hundred forty-two".