21100012121112 has 16 divisors (see below), whose sum is σ = 52750030302840. Its totient is φ = 7033337373696.

The previous prime is 21100012121107. The next prime is 21100012121159. The reversal of 21100012121112 is 21112121000112.

It is a happy number.

It is a super-2 number, since 2×21100012121112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21100012121091 and 21100012121100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439583585833 + ... + 439583585880.

Almost surely, 2^{21100012121112} is an apocalyptic number.

It is an amenable number.

21100012121112 is an abundant number, since it is smaller than the sum of its proper divisors (31650018181728).

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

21100012121112 is a wasteful number, since it uses less digits than its factorization.

21100012121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879167171722 (or 879167171718 counting only the distinct ones).

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

Adding to 21100012121112 its reverse (21112121000112), we get a palindrome (42212133121224).

The spelling of 21100012121112 in words is "twenty-one trillion, one hundred billion, twelve million, one hundred twenty-one thousand, one hundred twelve".