21625142 has 16 divisors (see below), whose sum is σ = 40442112. Its totient is φ = 8425320.

The previous prime is 21625117. The next prime is 21625181. The reversal of 21625142 is 24152612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70058 + ... + 70365.

It is an arithmetic number, because the mean of its divisors is an integer number (2527632).

Almost surely, 2^21625142 is an apocalyptic number.

21625142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21625142 is a deficient number, since it is larger than the sum of its proper divisors (18816970).

21625142 is a wasteful number, since it uses less digits than its factorization.

21625142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140443.

The product of its digits is 960, while the sum is 23.

The square root of 21625142 is about 4650.2840773441. The cubic root of 21625142 is about 278.6033425883.

Adding to 21625142 its reverse (24152612), we get a palindrome (45777754).

The spelling of 21625142 in words is "twenty-one million, six hundred twenty-five thousand, one hundred forty-two".