22221021012 has 12 divisors (see below), whose sum is σ = 51849049056. Its totient is φ = 7407007000.

The previous prime is 22221021001. The next prime is 22221021023. The reversal of 22221021012 is 21012012222.

It is an interprime number because it is at equal distance from previous prime (22221021001) and next prime (22221021023).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 22221020982 and 22221021000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925875864 + ... + 925875887.

It is an arithmetic number, because the mean of its divisors is an integer number (4320754088).

Almost surely, 2^22221021012 is an apocalyptic number.

It is an amenable number.

22221021012 is an abundant number, since it is smaller than the sum of its proper divisors (29628028044).

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

22221021012 is a wasteful number, since it uses less digits than its factorization.

22221021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851751758 (or 1851751756 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22221021012 its reverse (21012012222), we get a palindrome (43233033234).

The spelling of 22221021012 in words is "twenty-two billion, two hundred twenty-one million, twenty-one thousand, twelve".