21212220020201 has 8 divisors (see below), whose sum is σ = 24257851478784. Its totient is φ = 18170417139840.

The previous prime is 21212220020143. The next prime is 21212220020219. The reversal of 21212220020201 is 10202002221212.

It is a happy number.

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

It is not a de Polignac number, because 21212220020201 - 2¹⁴ = 21212220003817 is a prime.

It is a super-2 number, since 2×21212220020201² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212220020201.

It is not an unprimeable number, because it can be changed into a prime (21212220020291) 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, 957132680 + ... + 957154841.

It is an arithmetic number, because the mean of its divisors is an integer number (3032231434848).

Almost surely, 2^{21212220020201} is an apocalyptic number.

It is an amenable number.

21212220020201 is a deficient number, since it is larger than the sum of its proper divisors (3045631458583).

21212220020201 is a wasteful number, since it uses less digits than its factorization.

21212220020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914289111.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21212220020201 its reverse (10202002221212), we get a palindrome (31414222241413).

The spelling of 21212220020201 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, twenty thousand, two hundred one".