22021001012 has 12 divisors (see below), whose sum is σ = 38547024516. Its totient is φ = 11007565440.

The previous prime is 22021001011. The next prime is 22021001047. The reversal of 22021001012 is 21010012022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2856474916 + 19164526096 = 53446^2 + 138436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22021000984 and 22021001002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021001011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716843 + ... + 746930.

It is an arithmetic number, because the mean of its divisors is an integer number (3212252043).

Almost surely, 2^22021001012 is an apocalyptic number.

It is an amenable number.

22021001012 is a deficient number, since it is larger than the sum of its proper divisors (16526023504).

22021001012 is a wasteful number, since it uses less digits than its factorization.

22021001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467538 (or 1467536 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22021001012 its reverse (21010012022), we get a palindrome (43031013034).

The spelling of 22021001012 in words is "twenty-two billion, twenty-one million, one thousand, twelve".