1321639011 has 80 divisors (see below), whose sum is σ = 2546691840. Its totient is φ = 662800320.

The previous prime is 1321639003. The next prime is 1321639019. The reversal of 1321639011 is 1109361231.

1321639011 is a `hidden beast` number, since 1 + 3 + 21 + 639 + 0 + 1 + 1 = 666.

1321639011 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1321639003) and next prime (1321639019).

It is not a de Polignac number, because 1321639011 - 2³ = 1321639003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Together with 1225052829 it forms an amicable pair .

It is not an unprimeable number, because it can be changed into a prime (1321639019) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 177220 + ... + 184526.

It is an arithmetic number, because the mean of its divisors is an integer number (31833648).

Almost surely, 2^1321639011 is an apocalyptic number.

1321639011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321639011 is a deficient number, since it is larger than the sum of its proper divisors (1225052829).

1321639011 is a wasteful number, since it uses less digits than its factorization.

1321639011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7366 (or 7357 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1321639011 is about 36354.3533981833. The cubic root of 1321639011 is about 1097.4151458447.

The spelling of 1321639011 in words is "one billion, three hundred twenty-one million, six hundred thirty-nine thousand, eleven".