1268901021 has 16 divisors (see below), whose sum is σ = 1748298240. Its totient is φ = 817776960.

The previous prime is 1268901019. The next prime is 1268901079. The reversal of 1268901021 is 1201098621.

It is a happy number.

It is not a de Polignac number, because 1268901021 - 2¹ = 1268901019 is a prime.

It is a super-2 number, since 2×1268901021² = 3220219602189684882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1268901021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268901001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87475 + ... + 100943.

It is an arithmetic number, because the mean of its divisors is an integer number (109268640).

Almost surely, 2^1268901021 is an apocalyptic number.

It is an amenable number.

1268901021 is a deficient number, since it is larger than the sum of its proper divisors (479397219).

1268901021 is a wasteful number, since it uses less digits than its factorization.

1268901021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14516.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1268901021 is about 35621.6369781064. The cubic root of 1268901021 is about 1082.6196753195.

Adding to 1268901021 its reverse (1201098621), we get a palindrome (2469999642).

The spelling of 1268901021 in words is "one billion, two hundred sixty-eight million, nine hundred one thousand, twenty-one".