21531434222 has 8 divisors (see below), whose sum is σ = 33701375376. Its totient is φ = 10297642432.

The previous prime is 21531434219. The next prime is 21531434231. The reversal of 21531434222 is 22243413512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234037283 + ... + 234037374.

It is an arithmetic number, because the mean of its divisors is an integer number (4212671922).

Almost surely, 2^21531434222 is an apocalyptic number.

21531434222 is a deficient number, since it is larger than the sum of its proper divisors (12169941154).

21531434222 is a wasteful number, since it uses less digits than its factorization.

21531434222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468074682.

The product of its digits is 11520, while the sum is 29.

Adding to 21531434222 its reverse (22243413512), we get a palindrome (43774847734).

The spelling of 21531434222 in words is "twenty-one billion, five hundred thirty-one million, four hundred thirty-four thousand, two hundred twenty-two".