21222034142 has 4 divisors (see below), whose sum is σ = 31833051216. Its totient is φ = 10611017070.

The previous prime is 21222034123. The next prime is 21222034147. The reversal of 21222034142 is 24143022212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222034147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305508534 + ... + 5305508537.

It is an arithmetic number, because the mean of its divisors is an integer number (7958262804).

Almost surely, 2^21222034142 is an apocalyptic number.

21222034142 is a deficient number, since it is larger than the sum of its proper divisors (10611017074).

21222034142 is a wasteful number, since it uses less digits than its factorization.

21222034142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611017073.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21222034142 its reverse (24143022212), we get a palindrome (45365056354).

The spelling of 21222034142 in words is "twenty-one billion, two hundred twenty-two million, thirty-four thousand, one hundred forty-two".