21111322146 has 16 divisors (see below), whose sum is σ = 42224082624. Its totient is φ = 7036867664.

The previous prime is 21111322129. The next prime is 21111322147. The reversal of 21111322146 is 64122311112.

It is not an unprimeable number, because it can be changed into a prime (21111322147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274060 + ... + 342536.

It is an arithmetic number, because the mean of its divisors is an integer number (2639005164).

Almost surely, 2^21111322146 is an apocalyptic number.

21111322146 is an abundant number, since it is smaller than the sum of its proper divisors (21112760478).

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

21111322146 is a wasteful number, since it uses less digits than its factorization.

21111322146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119865.

The product of its digits is 576, while the sum is 24.

Adding to 21111322146 its reverse (64122311112), we get a palindrome (85233633258).

The spelling of 21111322146 in words is "twenty-one billion, one hundred eleven million, three hundred twenty-two thousand, one hundred forty-six".