21000010021112 has 8 divisors (see below), whose sum is σ = 39375018789600. Its totient is φ = 10500005010552.

The previous prime is 21000010021051. The next prime is 21000010021187. The reversal of 21000010021112 is 21112001000012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21000010021093 and 21000010021102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312500626312 + ... + 1312500626327.

It is an arithmetic number, because the mean of its divisors is an integer number (4921877348700).

Almost surely, 2^{21000010021112} is an apocalyptic number.

It is an amenable number.

21000010021112 is a deficient number, since it is larger than the sum of its proper divisors (18375008768488).

21000010021112 is a wasteful number, since it uses less digits than its factorization.

21000010021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625001252645 (or 2625001252641 counting only the distinct ones).

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

Adding to 21000010021112 its reverse (21112001000012), we get a palindrome (42112011021124).

The spelling of 21000010021112 in words is "twenty-one trillion, ten million, twenty-one thousand, one hundred twelve".