21220230044 has 24 divisors (see below), whose sum is σ = 40669807920. Its totient is φ = 9627951744.

The previous prime is 21220230029. The next prime is 21220230091. The reversal of 21220230044 is 44003202212.

It is a junction number, because it is equal to n+sod(n) for n = 21220229998 and 21220230025.

It is a congruent 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, 3455249 + ... + 3461384.

It is an arithmetic number, because the mean of its divisors is an integer number (1694575330).

Almost surely, 2^21220230044 is an apocalyptic number.

It is an amenable number.

21220230044 is a deficient number, since it is larger than the sum of its proper divisors (19449577876).

21220230044 is a wasteful number, since it uses less digits than its factorization.

21220230044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6916709 (or 6916707 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21220230044 its reverse (44003202212), we get a palindrome (65223432256).

The spelling of 21220230044 in words is "twenty-one billion, two hundred twenty million, two hundred thirty thousand, forty-four".