21211000122 has 32 divisors (see below), whose sum is σ = 46112213952. Its totient is φ = 6465464064.

The previous prime is 21211000117. The next prime is 21211000127. The reversal of 21211000122 is 22100011212.

It is an interprime number because it is at equal distance from previous prime (21211000117) and next prime (21211000127).

It is a junction number, because it is equal to n+sod(n) for n = 21211000098 and 21211000107.

It is not an unprimeable number, because it can be changed into a prime (21211000127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1262383 + ... + 1279074.

It is an arithmetic number, because the mean of its divisors is an integer number (1441006686).

Almost surely, 2^21211000122 is an apocalyptic number.

21211000122 is an abundant number, since it is smaller than the sum of its proper divisors (24901213830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211000122 is a wasteful number, since it uses less digits than its factorization.

21211000122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541582.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21211000122 its reverse (22100011212), we get a palindrome (43311011334).

The spelling of 21211000122 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-two", and thus it is an aban number.