1012320001221 has 64 divisors (see below), whose sum is σ = 1456555710720. Its totient is φ = 624078120960.

The previous prime is 1012320001169. The next prime is 1012320001271. The reversal of 1012320001221 is 1221000232101.

It is not a de Polignac number, because 1012320001221 - 2⁶ = 1012320001157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1012320001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012320001271) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 127123986 + ... + 127131948.

It is an arithmetic number, because the mean of its divisors is an integer number (22758682980).

Almost surely, 2^{1012320001221} is an apocalyptic number.

It is an amenable number.

1012320001221 is a deficient number, since it is larger than the sum of its proper divisors (444235709499).

1012320001221 is a wasteful number, since it uses less digits than its factorization.

1012320001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8646.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1012320001221 its reverse (1221000232101), we get a palindrome (2233320233322).

The spelling of 1012320001221 in words is "one trillion, twelve billion, three hundred twenty million, one thousand, two hundred twenty-one".