212013001021 has 2 divisors, whose sum is σ = 212013001022. Its totient is φ = 212013001020.

The previous prime is 212013001009. The next prime is 212013001037. The reversal of 212013001021 is 120100310212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115919820900 + 96093180121 = 340470^2 + 309989^2 .

It is a cyclic number.

It is not a de Polignac number, because 212013001021 - 2²¹ = 212010903869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212013000992 and 212013001010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212013001091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006500510 + 106006500511.

It is an arithmetic number, because the mean of its divisors is an integer number (106006500511).

Almost surely, 2^212013001021 is an apocalyptic number.

It is an amenable number.

212013001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212013001021 is an equidigital number, since it uses as much as digits as its factorization.

212013001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 212013001021 its reverse (120100310212), we get a palindrome (332113311233).

The spelling of 212013001021 in words is "two hundred twelve billion, thirteen million, one thousand, twenty-one".