213312023021 has 2 divisors, whose sum is σ = 213312023022. Its totient is φ = 213312023020.

The previous prime is 213312022999. The next prime is 213312023027. The reversal of 213312023021 is 120320213312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169583358025 + 43728664996 = 411805^2 + 209114^2 .

It is a cyclic number.

It is not a de Polignac number, because 213312023021 - 2²² = 213307828717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213312022984 and 213312023002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213312023027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106656011510 + 106656011511.

It is an arithmetic number, because the mean of its divisors is an integer number (106656011511).

Almost surely, 2^213312023021 is an apocalyptic number.

It is an amenable number.

213312023021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213312023021 is an equidigital number, since it uses as much as digits as its factorization.

213312023021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 213312023021 its reverse (120320213312), we get a palindrome (333632236333).

The spelling of 213312023021 in words is "two hundred thirteen billion, three hundred twelve million, twenty-three thousand, twenty-one".