21022232044 has 24 divisors (see below), whose sum is σ = 40145027328. Its totient is φ = 9552780240.

The previous prime is 21022232009. The next prime is 21022232057. The reversal of 21022232044 is 44023222012.

It is a super-2 number, since 2×21022232044² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 87457 + ... + 222919.

It is an arithmetic number, because the mean of its divisors is an integer number (1672709472).

Almost surely, 2^21022232044 is an apocalyptic number.

It is an amenable number.

21022232044 is a deficient number, since it is larger than the sum of its proper divisors (19122795284).

21022232044 is a wasteful number, since it uses less digits than its factorization.

21022232044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139005 (or 139003 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21022232044 its reverse (44023222012), we get a palindrome (65045454056).

The spelling of 21022232044 in words is "twenty-one billion, twenty-two million, two hundred thirty-two thousand, forty-four".