21110225142 has 32 divisors (see below), whose sum is σ = 43732108800. Its totient is φ = 6785418528.

The previous prime is 21110225141. The next prime is 21110225161. The reversal of 21110225142 is 24152201112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110225141) 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, 59859 + ... + 214017.

It is an arithmetic number, because the mean of its divisors is an integer number (1366628400).

Almost surely, 2^21110225142 is an apocalyptic number.

21110225142 is an abundant number, since it is smaller than the sum of its proper divisors (22621883658).

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

21110225142 is a wasteful number, since it uses less digits than its factorization.

21110225142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154980.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21110225142 its reverse (24152201112), we get a palindrome (45262426254).

The spelling of 21110225142 in words is "twenty-one billion, one hundred ten million, two hundred twenty-five thousand, one hundred forty-two".