21211000121100 has 36 divisors (see below), whose sum is σ = 61370493684584. Its totient is φ = 5656266698880.

The previous prime is 21211000121081. The next prime is 21211000121117. The reversal of 21211000121100 is 112100011212.

It is a super-2 number, since 2×21211000121100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35351666569 + ... + 35351667168.

Almost surely, 2^{21211000121100} is an apocalyptic number.

21211000121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211000121100 is an abundant number, since it is smaller than the sum of its proper divisors (40159493563484).

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

21211000121100 is a wasteful number, since it uses less digits than its factorization.

21211000121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70703333754 (or 70703333747 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211000121100 its reverse (112100011212), we get a palindrome (21323100132312).

The spelling of 21211000121100 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one thousand, one hundred".