21000120021110 has 64 divisors (see below), whose sum is σ = 39471943265280. Its totient is φ = 8029078611840.

The previous prime is 21000120021109. The next prime is 21000120021149. The reversal of 21000120021110 is 1112002100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000120021091 and 21000120021100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2665324151 + ... + 2665332029.

It is an arithmetic number, because the mean of its divisors is an integer number (616749113520).

Almost surely, 2^{21000120021110} is an apocalyptic number.

21000120021110 is a deficient number, since it is larger than the sum of its proper divisors (18471823244170).

21000120021110 is a wasteful number, since it uses less digits than its factorization.

21000120021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14733.

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

Adding to 21000120021110 its reverse (1112002100012), we get a palindrome (22112122121122).

The spelling of 21000120021110 in words is "twenty-one trillion, one hundred twenty million, twenty-one thousand, one hundred ten".