21011112001982 has 32 divisors (see below), whose sum is σ = 32412197109600. Its totient is φ = 10209637307520.

The previous prime is 21011112001967. The next prime is 21011112002021. The reversal of 21011112001982 is 28910021111012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13077188 + ... + 14595720.

It is an arithmetic number, because the mean of its divisors is an integer number (1012881159675).

Almost surely, 2^{21011112001982} is an apocalyptic number.

21011112001982 is a deficient number, since it is larger than the sum of its proper divisors (11401085107618).

21011112001982 is a wasteful number, since it uses less digits than its factorization.

21011112001982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519388.

The product of its (nonzero) digits is 576, while the sum is 29.

Adding to 21011112001982 its reverse (28910021111012), we get a palindrome (49921133112994).

The spelling of 21011112001982 in words is "twenty-one trillion, eleven billion, one hundred twelve million, one thousand, nine hundred eighty-two".