21442245164 has 6 divisors (see below), whose sum is σ = 37523929044. Its totient is φ = 10721122580.

The previous prime is 21442245119. The next prime is 21442245179. The reversal of 21442245164 is 46154224412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680280642 + ... + 2680280649.

It is an arithmetic number, because the mean of its divisors is an integer number (6253988174).

Almost surely, 2^21442245164 is an apocalyptic number.

It is an amenable number.

21442245164 is a deficient number, since it is larger than the sum of its proper divisors (16081683880).

21442245164 is a wasteful number, since it uses less digits than its factorization.

21442245164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360561295 (or 5360561293 counting only the distinct ones).

The product of its digits is 61440, while the sum is 35.

Adding to 21442245164 its reverse (46154224412), we get a palindrome (67596469576).

The spelling of 21442245164 in words is "twenty-one billion, four hundred forty-two million, two hundred forty-five thousand, one hundred sixty-four".