1263221016 has 32 divisors (see below), whose sum is σ = 3163617600. Its totient is φ = 420331680.

The previous prime is 1263220993. The next prime is 1263221017. The reversal of 1263221016 is 6101223621.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263221017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32386 + ... + 59793.

It is an arithmetic number, because the mean of its divisors is an integer number (98863050).

Almost surely, 2^1263221016 is an apocalyptic number.

It is an amenable number.

1263221016 is an abundant number, since it is smaller than the sum of its proper divisors (1900396584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1263221016 is a wasteful number, since it uses less digits than its factorization.

1263221016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92759 (or 92755 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1263221016 is about 35541.8206624253. The cubic root of 1263221016 is about 1081.0018755229.

Adding to 1263221016 its reverse (6101223621), we get a palindrome (7364444637).

The spelling of 1263221016 in words is "one billion, two hundred sixty-three million, two hundred twenty-one thousand, sixteen".