21201021122 has 16 divisors (see below), whose sum is σ = 31985527200. Its totient is φ = 10539322560.

The previous prime is 21201021073. The next prime is 21201021133. The reversal of 21201021122 is 22112010212.

It is a junction number, because it is equal to n+sod(n) for n = 21201021097 and 21201021106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262829 + ... + 333887.

It is an arithmetic number, because the mean of its divisors is an integer number (1999095450).

Almost surely, 2^21201021122 is an apocalyptic number.

21201021122 is a deficient number, since it is larger than the sum of its proper divisors (10784506078).

21201021122 is a wasteful number, since it uses less digits than its factorization.

21201021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71921.

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

Adding to 21201021122 its reverse (22112010212), we get a palindrome (43313031334).

The spelling of 21201021122 in words is "twenty-one billion, two hundred one million, twenty-one thousand, one hundred twenty-two".