21235431222 has 24 divisors (see below), whose sum is σ = 46081681464. Its totient is φ = 7067464704.

The previous prime is 21235431193. The next prime is 21235431247. The reversal of 21235431222 is 22213453212.

21235431222 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 5 + 431 + 222 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 905803 + ... + 928950.

It is an arithmetic number, because the mean of its divisors is an integer number (1920070061).

Almost surely, 2^21235431222 is an apocalyptic number.

21235431222 is an abundant number, since it is smaller than the sum of its proper divisors (24846250242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21235431222 is a wasteful number, since it uses less digits than its factorization.

21235431222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835404 (or 1835401 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

Adding to 21235431222 its reverse (22213453212), we get a palindrome (43448884434).

It can be divided in two parts, 2123 and 5431222, that added together give a palindrome (5433345).

The spelling of 21235431222 in words is "twenty-one billion, two hundred thirty-five million, four hundred thirty-one thousand, two hundred twenty-two".