21212021199 has 8 divisors (see below), whose sum is σ = 28390234752. Its totient is φ = 14087577560.

The previous prime is 21212021161. The next prime is 21212021221. The reversal of 21212021199 is 99112021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212021199 - 2⁷ = 21212021071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212029199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13441557 + ... + 13443134.

It is an arithmetic number, because the mean of its divisors is an integer number (3548779344).

Almost surely, 2^21212021199 is an apocalyptic number.

21212021199 is a deficient number, since it is larger than the sum of its proper divisors (7178213553).

21212021199 is a wasteful number, since it uses less digits than its factorization.

21212021199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26884957.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 21212021199 in words is "twenty-one billion, two hundred twelve million, twenty-one thousand, one hundred ninety-nine".