21220022234 has 16 divisors (see below), whose sum is σ = 34338285288. Its totient is φ = 9797478912.

The previous prime is 21220022231. The next prime is 21220022261. The reversal of 21220022234 is 43222002212.

It can be written as a sum of positive squares in 4 ways, for example, as 15939820009 + 5280202225 = 126253^2 + 72665^2 .

It is a super-2 number, since 2×21220022234² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220022231) 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, 5886107 + ... + 5889710.

Almost surely, 2^21220022234 is an apocalyptic number.

21220022234 is a deficient number, since it is larger than the sum of its proper divisors (13118263054).

21220022234 is a wasteful number, since it uses less digits than its factorization.

21220022234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11775889.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21220022234 its reverse (43222002212), we get a palindrome (64442024446).

The spelling of 21220022234 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred thirty-four".