21012021022 has 8 divisors (see below), whose sum is σ = 31520226456. Its totient is φ = 10505278872.

The previous prime is 21012021001. The next prime is 21012021049. The reversal of 21012021022 is 22012021012.

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 = 21012020993 and 21012021011.

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, 329188 + ... + 387799.

It is an arithmetic number, because the mean of its divisors is an integer number (3940028307).

Almost surely, 2^21012021022 is an apocalyptic number.

21012021022 is a deficient number, since it is larger than the sum of its proper divisors (10508205434).

21012021022 is a wasteful number, since it uses less digits than its factorization.

21012021022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731642.

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

Adding to 21012021022 its reverse (22012021012), we get a palindrome (43024042034).

The spelling of 21012021022 in words is "twenty-one billion, twelve million, twenty-one thousand, twenty-two".