21000212199999 has 16 divisors (see below), whose sum is σ = 31129503078240. Its totient is φ = 13992006548160.

The previous prime is 21000212199971. The next prime is 21000212200043. The reversal of 21000212199999 is 99999121200012.

It is not a de Polignac number, because 21000212199999 - 2¹³ = 21000212191807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000212299999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225922632 + ... + 226015565.

It is an arithmetic number, because the mean of its divisors is an integer number (1945593942390).

Almost surely, 2^{21000212199999} is an apocalyptic number.

21000212199999 is a deficient number, since it is larger than the sum of its proper divisors (10129290878241).

21000212199999 is a wasteful number, since it uses less digits than its factorization.

21000212199999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451939927 (or 451939921 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The spelling of 21000212199999 in words is "twenty-one trillion, two hundred twelve million, one hundred ninety-nine thousand, nine hundred ninety-nine".