213013124021 has 2 divisors, whose sum is σ = 213013124022. Its totient is φ = 213013124020.

The previous prime is 213013124003. The next prime is 213013124099. The reversal of 213013124021 is 120421310312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175318901521 + 37694222500 = 418711^2 + 194150^2 .

It is a cyclic number.

It is not a de Polignac number, because 213013124021 - 2¹⁸ = 213012861877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213013123984 and 213013124002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213013124221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106506562010 + 106506562011.

It is an arithmetic number, because the mean of its divisors is an integer number (106506562011).

Almost surely, 2^213013124021 is an apocalyptic number.

It is an amenable number.

213013124021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213013124021 is an equidigital number, since it uses as much as digits as its factorization.

213013124021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 213013124021 its reverse (120421310312), we get a palindrome (333434434333).

The spelling of 213013124021 in words is "two hundred thirteen billion, thirteen million, one hundred twenty-four thousand, twenty-one".