1021273263 has 12 divisors (see below), whose sum is σ = 1509479400. Its totient is φ = 665014896.

The previous prime is 1021273243. The next prime is 1021273273. The reversal of 1021273263 is 3623721201.

It is not a de Polignac number, because 1021273263 - 2⁸ = 1021273007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021273243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1319088 + ... + 1319861.

It is an arithmetic number, because the mean of its divisors is an integer number (125789950).

Almost surely, 2^1021273263 is an apocalyptic number.

1021273263 is a deficient number, since it is larger than the sum of its proper divisors (488206137).

1021273263 is a wasteful number, since it uses less digits than its factorization.

1021273263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638998 (or 2638995 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 1021273263 is about 31957.3663339143. The cubic root of 1021273263 is about 1007.0413901184.

Adding to 1021273263 its reverse (3623721201), we get a palindrome (4644994464).

The spelling of 1021273263 in words is "one billion, twenty-one million, two hundred seventy-three thousand, two hundred sixty-three".