1221306021023 has 8 divisors (see below), whose sum is σ = 1332394657536. Its totient is φ = 1110227520600.

The previous prime is 1221306021011. The next prime is 1221306021031. The reversal of 1221306021023 is 3201206031221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1221306021023 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 1221306021023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221306021323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2280983 + ... + 2765048.

It is an arithmetic number, because the mean of its divisors is an integer number (166549332192).

Almost surely, 2^{1221306021023} is an apocalyptic number.

1221306021023 is a deficient number, since it is larger than the sum of its proper divisors (111088636513).

1221306021023 is a wasteful number, since it uses less digits than its factorization.

1221306021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5068045.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 1221306021023 in words is "one trillion, two hundred twenty-one billion, three hundred six million, twenty-one thousand, twenty-three".