21101212122 has 16 divisors (see below), whose sum is σ = 43563793152. Its totient is φ = 6806842560.

The previous prime is 21101212103. The next prime is 21101212123. The reversal of 21101212122 is 22121210112.

It is a super-2 number, since 2×21101212122² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21101212123) 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, 56723503 + ... + 56723874.

It is an arithmetic number, because the mean of its divisors is an integer number (2722737072).

Almost surely, 2^21101212122 is an apocalyptic number.

21101212122 is an abundant number, since it is smaller than the sum of its proper divisors (22462581030).

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

21101212122 is a wasteful number, since it uses less digits than its factorization.

21101212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113447413.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21101212122 its reverse (22121210112), we get a palindrome (43222422234).

The spelling of 21101212122 in words is "twenty-one billion, one hundred one million, two hundred twelve thousand, one hundred twenty-two".