21212210121201 has 24 divisors (see below), whose sum is σ = 35391494964384. Its totient is φ = 12099656396160.

The previous prime is 21212210121073. The next prime is 21212210121227. The reversal of 21212210121201 is 10212101221212.

21212210121201 is a `hidden beast` number, since 2 + 121 + 221 + 0 + 121 + 201 = 666.

It is not a de Polignac number, because 21212210121201 - 2⁷ = 21212210121073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212210141201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6301902691 + ... + 6301906056.

It is an arithmetic number, because the mean of its divisors is an integer number (1474645623516).

Almost surely, 2^{21212210121201} is an apocalyptic number.

It is an amenable number.

21212210121201 is a deficient number, since it is larger than the sum of its proper divisors (14179284843183).

21212210121201 is a wasteful number, since it uses less digits than its factorization.

21212210121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12603808781 (or 12603808778 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21212210121201 its reverse (10212101221212), we get a palindrome (31424311342413).

The spelling of 21212210121201 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, two hundred one".