21021102122 has 8 divisors (see below), whose sum is σ = 31543344000. Its totient is φ = 10506654124.

The previous prime is 21021102107. The next prime is 21021102209. The reversal of 21021102122 is 22120112012.

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 = 21021102097 and 21021102106.

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, 1941722 + ... + 1952517.

It is an arithmetic number, because the mean of its divisors is an integer number (3942918000).

Almost surely, 2^21021102122 is an apocalyptic number.

21021102122 is a deficient number, since it is larger than the sum of its proper divisors (10522241878).

21021102122 is a wasteful number, since it uses less digits than its factorization.

21021102122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3896940.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021102122 its reverse (22120112012), we get a palindrome (43141214134).

The spelling of 21021102122 in words is "twenty-one billion, twenty-one million, one hundred two thousand, one hundred twenty-two".