1221043400302 has 64 divisors (see below), whose sum is σ = 2072430360000. Its totient is φ = 534467727360.

The previous prime is 1221043400281. The next prime is 1221043400323. The reversal of 1221043400302 is 2030043401221.

It is an interprime number because it is at equal distance from previous prime (1221043400281) and next prime (1221043400323).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 646395774 + ... + 646397662.

It is an arithmetic number, because the mean of its divisors is an integer number (32381724375).

Almost surely, 2^{1221043400302} is an apocalyptic number.

1221043400302 is a deficient number, since it is larger than the sum of its proper divisors (851386959698).

1221043400302 is a wasteful number, since it uses less digits than its factorization.

1221043400302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 1221043400302 its reverse (2030043401221), we get a palindrome (3251086801523).

The spelling of 1221043400302 in words is "one trillion, two hundred twenty-one billion, forty-three million, four hundred thousand, three hundred two".