21012012022 has 8 divisors (see below), whose sum is σ = 31525365816. Its totient is φ = 10503556752.

The previous prime is 21012011989. The next prime is 21012012067. The reversal of 21012012022 is 22021021012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21012011993 and 21012012011.

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, 1213888 + ... + 1231075.

It is an arithmetic number, because the mean of its divisors is an integer number (3940670727).

Almost surely, 2^21012012022 is an apocalyptic number.

21012012022 is a deficient number, since it is larger than the sum of its proper divisors (10513353794).

21012012022 is a wasteful number, since it uses less digits than its factorization.

21012012022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449262.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21012012022 its reverse (22021021012), we get a palindrome (43033033034).

The spelling of 21012012022 in words is "twenty-one billion, twelve million, twelve thousand, twenty-two".