21010122211 has 8 divisors (see below), whose sum is σ = 22629494160. Its totient is φ = 19391208672.

The previous prime is 21010122209. The next prime is 21010122251. The reversal of 21010122211 is 11222101012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010122211 - 2¹ = 21010122209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21010122191 and 21010122200.

It is not an unprimeable number, because it can be changed into a prime (21010122251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16276 + ... + 205633.

It is an arithmetic number, because the mean of its divisors is an integer number (2828686770).

Almost surely, 2^21010122211 is an apocalyptic number.

21010122211 is a deficient number, since it is larger than the sum of its proper divisors (1619371949).

21010122211 is a wasteful number, since it uses less digits than its factorization.

21010122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229205.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010122211 its reverse (11222101012), we get a palindrome (32232223223).

The spelling of 21010122211 in words is "twenty-one billion, ten million, one hundred twenty-two thousand, two hundred eleven".