1268020621 has 16 divisors (see below), whose sum is σ = 1547504640. Its totient is φ = 1015539840.

The previous prime is 1268020609. The next prime is 1268020643. The reversal of 1268020621 is 1260208621.

It is not a de Polignac number, because 1268020621 - 2¹⁹ = 1267496333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1268020621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268020681) 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, 94456 + ... + 107041.

It is an arithmetic number, because the mean of its divisors is an integer number (96719040).

Almost surely, 2^1268020621 is an apocalyptic number.

It is an amenable number.

1268020621 is a deficient number, since it is larger than the sum of its proper divisors (279484019).

1268020621 is a wasteful number, since it uses less digits than its factorization.

1268020621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201564.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1268020621 is about 35609.2771760394. The cubic root of 1268020621 is about 1082.3692331732.

The spelling of 1268020621 in words is "one billion, two hundred sixty-eight million, twenty thousand, six hundred twenty-one".