1303640121 has 16 divisors (see below), whose sum is σ = 2103352704. Its totient is φ = 701117184.

The previous prime is 1303640101. The next prime is 1303640123. The reversal of 1303640121 is 1210463031.

It is not a de Polignac number, because 1303640121 - 2⁶ = 1303640057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1303640123) 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, 1825470 + ... + 1826183.

It is an arithmetic number, because the mean of its divisors is an integer number (131459544).

Almost surely, 2^1303640121 is an apocalyptic number.

It is an amenable number.

1303640121 is a deficient number, since it is larger than the sum of its proper divisors (799712583).

1303640121 is a wasteful number, since it uses less digits than its factorization.

1303640121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651680.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1303640121 is about 36105.9568630995. The cubic root of 1303640121 is about 1092.4106009684.

The spelling of 1303640121 in words is "one billion, three hundred three million, six hundred forty thousand, one hundred twenty-one".