21051222044 has 12 divisors (see below), whose sum is σ = 36865428600. Its totient is φ = 10518242448.

The previous prime is 21051222001. The next prime is 21051222097. The reversal of 21051222044 is 44022215012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835714 + ... + 1847145.

It is an arithmetic number, because the mean of its divisors is an integer number (3072119050).

Almost surely, 2^21051222044 is an apocalyptic number.

It is an amenable number.

21051222044 is a deficient number, since it is larger than the sum of its proper divisors (15814206556).

21051222044 is a wasteful number, since it uses less digits than its factorization.

21051222044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684292 (or 3684290 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21051222044 its reverse (44022215012), we get a palindrome (65073437056).

The spelling of 21051222044 in words is "twenty-one billion, fifty-one million, two hundred twenty-two thousand, forty-four".