21142210444 has 6 divisors (see below), whose sum is σ = 36998868284. Its totient is φ = 10571105220.

The previous prime is 21142210417. The next prime is 21142210447. The reversal of 21142210444 is 44401224112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21142210447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2642776302 + ... + 2642776309.

Almost surely, 2^21142210444 is an apocalyptic number.

It is an amenable number.

21142210444 is a deficient number, since it is larger than the sum of its proper divisors (15856657840).

21142210444 is a wasteful number, since it uses less digits than its factorization.

21142210444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285552615 (or 5285552613 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21142210444 its reverse (44401224112), we get a palindrome (65543434556).

The spelling of 21142210444 in words is "twenty-one billion, one hundred forty-two million, two hundred ten thousand, four hundred forty-four".