21022231442 has 16 divisors (see below), whose sum is σ = 31595772480. Its totient is φ = 10490325552.

The previous prime is 21022231441. The next prime is 21022231523. The reversal of 21022231442 is 24413222012.

It is not an unprimeable number, because it can be changed into a prime (21022231441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3546293 + ... + 3552215.

It is an arithmetic number, because the mean of its divisors is an integer number (1974735780).

Almost surely, 2^21022231442 is an apocalyptic number.

21022231442 is a deficient number, since it is larger than the sum of its proper divisors (10573541038).

21022231442 is a wasteful number, since it uses less digits than its factorization.

21022231442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9137.

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

Adding to 21022231442 its reverse (24413222012), we get a palindrome (45435453454).

The spelling of 21022231442 in words is "twenty-one billion, twenty-two million, two hundred thirty-one thousand, four hundred forty-two".