21000021212012 has 6 divisors (see below), whose sum is σ = 36750037121028. Its totient is φ = 10500010606004.

The previous prime is 21000021211973. The next prime is 21000021212101. The reversal of 21000021212012 is 21021212000012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625002651498 + ... + 2625002651505.

It is an arithmetic number, because the mean of its divisors is an integer number (6125006186838).

Almost surely, 2^{21000021212012} is an apocalyptic number.

It is an amenable number.

21000021212012 is a deficient number, since it is larger than the sum of its proper divisors (15750015909016).

21000021212012 is a wasteful number, since it uses less digits than its factorization.

21000021212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250005303007 (or 5250005303005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000021212012 its reverse (21021212000012), we get a palindrome (42021233212024).

The spelling of 21000021212012 in words is "twenty-one trillion, twenty-one million, two hundred twelve thousand, twelve".