1023023220421 has 2 divisors, whose sum is σ = 1023023220422. Its totient is φ = 1023023220420.

The previous prime is 1023023220413. The next prime is 1023023220433. The reversal of 1023023220421 is 1240223203201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1017485777025 + 5537443396 = 1008705^2 + 74414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023023220421 - 2³ = 1023023220413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1023023220392 and 1023023220401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023023220481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511511610210 + 511511610211.

It is an arithmetic number, because the mean of its divisors is an integer number (511511610211).

Almost surely, 2^{1023023220421} is an apocalyptic number.

It is an amenable number.

1023023220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023023220421 is an equidigital number, since it uses as much as digits as its factorization.

1023023220421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 1023023220421 its reverse (1240223203201), we get a palindrome (2263246423622).

The spelling of 1023023220421 in words is "one trillion, twenty-three billion, twenty-three million, two hundred twenty thousand, four hundred twenty-one".