21220024142 has 16 divisors (see below), whose sum is σ = 33307111872. Its totient is φ = 10128474720.

The previous prime is 21220024097. The next prime is 21220024151. The reversal of 21220024142 is 24142002212.

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, 2701334 + ... + 2709177.

It is an arithmetic number, because the mean of its divisors is an integer number (2081694492).

Almost surely, 2^21220024142 is an apocalyptic number.

21220024142 is a deficient number, since it is larger than the sum of its proper divisors (12087087730).

21220024142 is a wasteful number, since it uses less digits than its factorization.

21220024142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5410603.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21220024142 its reverse (24142002212), we get a palindrome (45362026354).

The spelling of 21220024142 in words is "twenty-one billion, two hundred twenty million, twenty-four thousand, one hundred forty-two".