21010012022 has 4 divisors (see below), whose sum is σ = 31515018036. Its totient is φ = 10505006010.

The previous prime is 21010012019. The next prime is 21010012027. The reversal of 21010012022 is 22021001012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21010011994 and 21010012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010012027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252503004 + ... + 5252503007.

It is an arithmetic number, because the mean of its divisors is an integer number (7878754509).

Almost surely, 2^21010012022 is an apocalyptic number.

21010012022 is a deficient number, since it is larger than the sum of its proper divisors (10505006014).

21010012022 is a wasteful number, since it uses less digits than its factorization.

21010012022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505006013.

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

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

The spelling of 21010012022 in words is "twenty-one billion, ten million, twelve thousand, twenty-two".