21021020122 has 8 divisors (see below), whose sum is σ = 31837661856. Its totient is φ = 10408466172.

The previous prime is 21021020117. The next prime is 21021020159. The reversal of 21021020122 is 22102012012.

It is a happy number.

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

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, 51021688 + ... + 51022099.

It is an arithmetic number, because the mean of its divisors is an integer number (3979707732).

Almost surely, 2^21021020122 is an apocalyptic number.

21021020122 is a deficient number, since it is larger than the sum of its proper divisors (10816641734).

21021020122 is a wasteful number, since it uses less digits than its factorization.

21021020122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102043892.

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

Adding to 21021020122 its reverse (22102012012), we get a palindrome (43123032134).

The spelling of 21021020122 in words is "twenty-one billion, twenty-one million, twenty thousand, one hundred twenty-two".