23021420440213 has 4 divisors (see below), whose sum is σ = 24792298935628. Its totient is φ = 21250541944800.

The previous prime is 23021420440189. The next prime is 23021420440231. The reversal of 23021420440213 is 31204402412032.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14180895657009 + 8840524783204 = 3765753^2 + 2973302^2 .

It is a cyclic number.

It is not a de Polignac number, because 23021420440213 - 2⁹ = 23021420439701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021420440283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885439247688 + ... + 885439247713.

It is an arithmetic number, because the mean of its divisors is an integer number (6198074733907).

Almost surely, 2^{23021420440213} is an apocalyptic number.

It is an amenable number.

23021420440213 is a deficient number, since it is larger than the sum of its proper divisors (1770878495415).

23021420440213 is a wasteful number, since it uses less digits than its factorization.

23021420440213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770878495414.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 23021420440213 its reverse (31204402412032), we get a palindrome (54225822852245).

The spelling of 23021420440213 in words is "twenty-three trillion, twenty-one billion, four hundred twenty million, four hundred forty thousand, two hundred thirteen".