21431033122242 has 16 divisors (see below), whose sum is σ = 43670784476160. Its totient is φ = 7008891335472.

The previous prime is 21431033122183. The next prime is 21431033122271. The reversal of 21431033122242 is 24222133013412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33696592642 + ... + 33696593277.

It is an arithmetic number, because the mean of its divisors is an integer number (2729424029760).

Almost surely, 2^{21431033122242} is an apocalyptic number.

21431033122242 is an abundant number, since it is smaller than the sum of its proper divisors (22239751353918).

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

21431033122242 is a wasteful number, since it uses less digits than its factorization.

21431033122242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67393185977.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 21431033122242 its reverse (24222133013412), we get a palindrome (45653166135654).

The spelling of 21431033122242 in words is "twenty-one trillion, four hundred thirty-one billion, thirty-three million, one hundred twenty-two thousand, two hundred forty-two".