21122111000 has 32 divisors (see below), whose sum is σ = 49425742080. Its totient is φ = 8448844000.

The previous prime is 21122110981. The next prime is 21122111009. The reversal of 21122111000 is 11122112.

It is a super-2 number, since 2×21122111000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122111009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10560056 + ... + 10562055.

It is an arithmetic number, because the mean of its divisors is an integer number (1544554440).

Almost surely, 2^21122111000 is an apocalyptic number.

21122111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122111000 is an abundant number, since it is smaller than the sum of its proper divisors (28303631080).

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

21122111000 is a wasteful number, since it uses less digits than its factorization.

21122111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21122132 (or 21122118 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21122111000 its reverse (11122112), we get a palindrome (21133233112).

It can be divided in two parts, 2112 and 2111000, that added together give a palindrome (2113112).

The spelling of 21122111000 in words is "twenty-one billion, one hundred twenty-two million, one hundred eleven thousand".