1221402425145 has 128 divisors (see below), whose sum is σ = 2369986560000. Its totient is φ = 536266725120.

The previous prime is 1221402425107. The next prime is 1221402425167. The reversal of 1221402425145 is 5415242041221.

It is not a de Polignac number, because 1221402425145 - 2⁶ = 1221402425081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 28476726 + ... + 28519584.

It is an arithmetic number, because the mean of its divisors is an integer number (18515520000).

Almost surely, 2^{1221402425145} is an apocalyptic number.

1221402425145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221402425145 is a deficient number, since it is larger than the sum of its proper divisors (1148584134855).

1221402425145 is a wasteful number, since it uses less digits than its factorization.

1221402425145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43108 (or 43094 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 33.

Adding to 1221402425145 its reverse (5415242041221), we get a palindrome (6636644466366).

The spelling of 1221402425145 in words is "one trillion, two hundred twenty-one billion, four hundred two million, four hundred twenty-five thousand, one hundred forty-five".