21122112110100 has 144 divisors (see below), whose sum is σ = 62834900142336. Its totient is φ = 5474905344000.

The previous prime is 21122112110081. The next prime is 21122112110111. The reversal of 21122112110100 is 101121122112.

It is a happy number.

It is a super-2 number, since 2×21122112110100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21122112110100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164952 + ... + 6501648.

Almost surely, 2^{21122112110100} is an apocalyptic number.

21122112110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122112110100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31417450071168).

21122112110100 is an abundant number, since it is smaller than the sum of its proper divisors (41712788032236).

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

21122112110100 is a wasteful number, since it uses less digits than its factorization.

21122112110100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6337026 (or 6337019 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21122112110100 its reverse (101121122112), we get a palindrome (21223233232212).

The spelling of 21122112110100 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, one hundred ten thousand, one hundred".