21212202120001 has 2 divisors, whose sum is σ = 21212202120002. Its totient is φ = 21212202120000.

The previous prime is 21212202119989. The next prime is 21212202120059. The reversal of 21212202120001 is 10002120221212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21140905109776 + 71297010225 = 4597924^2 + 267015^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212202120001 - 2²⁷ = 21212067902273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212202120401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606101060000 + 10606101060001.

It is an arithmetic number, because the mean of its divisors is an integer number (10606101060001).

Almost surely, 2^{21212202120001} is an apocalyptic number.

It is an amenable number.

21212202120001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212202120001 is an equidigital number, since it uses as much as digits as its factorization.

21212202120001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212202120001 its reverse (10002120221212), we get a palindrome (31214322341213).

The spelling of 21212202120001 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred twenty thousand, one".