1021423231 has 2 divisors, whose sum is σ = 1021423232. Its totient is φ = 1021423230.

The previous prime is 1021423219. The next prime is 1021423259. The reversal of 1021423231 is 1323241201.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1323241201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021423231 - 2⁵ = 1021423199 is a prime.

It is a super-2 number, since 2×1021423231² = 2086610833652958722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021423199 and 1021423208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021423211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510711615 + 510711616.

It is an arithmetic number, because the mean of its divisors is an integer number (510711616).

Almost surely, 2^1021423231 is an apocalyptic number.

1021423231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021423231 is an equidigital number, since it uses as much as digits as its factorization.

1021423231 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 19.

The square root of 1021423231 is about 31959.7126238644. The cubic root of 1021423231 is about 1007.0906804167.

Adding to 1021423231 its reverse (1323241201), we get a palindrome (2344664432).

The spelling of 1021423231 in words is "one billion, twenty-one million, four hundred twenty-three thousand, two hundred thirty-one".