21220233142 has 32 divisors (see below), whose sum is σ = 33671705760. Its totient is φ = 10017665280.

The previous prime is 21220233137. The next prime is 21220233161. The reversal of 21220233142 is 24133202212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356728 + ... + 411940.

It is an arithmetic number, because the mean of its divisors is an integer number (1052240805).

Almost surely, 2^21220233142 is an apocalyptic number.

21220233142 is a deficient number, since it is larger than the sum of its proper divisors (12451472618).

21220233142 is a wasteful number, since it uses less digits than its factorization.

21220233142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55408.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21220233142 its reverse (24133202212), we get a palindrome (45353435354).

The spelling of 21220233142 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-three thousand, one hundred forty-two".