21022101201209 has 16 divisors (see below), whose sum is σ = 22899583224000. Its totient is φ = 19222204921920.

The previous prime is 21022101201197. The next prime is 21022101201271. The reversal of 21022101201209 is 90210210122012.

It is a de Polignac number, because none of the positive numbers 2^k-21022101201209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022101201289) 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, 5091299 + ... + 8244120.

It is an arithmetic number, because the mean of its divisors is an integer number (1431223951500).

Almost surely, 2^{21022101201209} is an apocalyptic number.

21022101201209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21022101201209 is a deficient number, since it is larger than the sum of its proper divisors (1877482022791).

21022101201209 is a wasteful number, since it uses less digits than its factorization.

21022101201209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13338328.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21022101201209 in words is "twenty-one trillion, twenty-two billion, one hundred one million, two hundred one thousand, two hundred nine".