20021223293 has 2 divisors, whose sum is σ = 20021223294. Its totient is φ = 20021223292.

The previous prime is 20021223281. The next prime is 20021223307. The reversal of 20021223293 is 39232212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19521119524 + 500103769 = 139718^2 + 22363^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021223293 - 2²² = 20017028989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021223263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010611646 + 10010611647.

It is an arithmetic number, because the mean of its divisors is an integer number (10010611647).

Almost surely, 2^20021223293 is an apocalyptic number.

It is an amenable number.

20021223293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021223293 is an equidigital number, since it uses as much as digits as its factorization.

20021223293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 20021223293 its reverse (39232212002), we get a palindrome (59253435295).

The spelling of 20021223293 in words is "twenty billion, twenty-one million, two hundred twenty-three thousand, two hundred ninety-three".