21212001202209 has 8 divisors (see below), whose sum is σ = 28353198616032. Its totient is φ = 14106068961600.

The previous prime is 21212001202121. The next prime is 21212001202211. The reversal of 21212001202209 is 90220210021212.

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

It is not a de Polignac number, because 21212001202209 - 2²⁸ = 21211732766753 is a prime.

It is a super-2 number, since 2×21212001202209² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212001202219) 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, 8816291899 + ... + 8816294304.

It is an arithmetic number, because the mean of its divisors is an integer number (3544149827004).

Almost surely, 2^{21212001202209} is an apocalyptic number.

It is an amenable number.

21212001202209 is a deficient number, since it is larger than the sum of its proper divisors (7141197413823).

21212001202209 is a wasteful number, since it uses less digits than its factorization.

21212001202209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17632586607.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 21212001202209 in words is "twenty-one trillion, two hundred twelve billion, one million, two hundred two thousand, two hundred nine".