21001112121004 has 48 divisors (see below), whose sum is σ = 39424254105600. Its totient is φ = 9763143039936.

The previous prime is 21001112120951. The next prime is 21001112121023. The reversal of 21001112121004 is 40012121110012.

It is a super-2 number, since 2×21001112121004² (a number of 27 digits) contains 22 as substring.

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, 567777 + ... + 6505735.

It is an arithmetic number, because the mean of its divisors is an integer number (821338627200).

Almost surely, 2^{21001112121004} is an apocalyptic number.

It is an amenable number.

21001112121004 is a deficient number, since it is larger than the sum of its proper divisors (18423141984596).

21001112121004 is a wasteful number, since it uses less digits than its factorization.

21001112121004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5939062 (or 5939060 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21001112121004 its reverse (40012121110012), we get a palindrome (61013233231016).

The spelling of 21001112121004 in words is "twenty-one trillion, one billion, one hundred twelve million, one hundred twenty-one thousand, four".