1221400541245 has 8 divisors (see below), whose sum is σ = 1465797206016. Its totient is φ = 977042728656.

The previous prime is 1221400541213. The next prime is 1221400541261. The reversal of 1221400541245 is 5421450041221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221400541245 - 2⁵ = 1221400541213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9643837 + ... + 9769666.

It is an arithmetic number, because the mean of its divisors is an integer number (183224650752).

Almost surely, 2^{1221400541245} is an apocalyptic number.

It is an amenable number.

1221400541245 is a deficient number, since it is larger than the sum of its proper divisors (244396664771).

1221400541245 is a wasteful number, since it uses less digits than its factorization.

1221400541245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19426091.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 1221400541245 its reverse (5421450041221), we get a palindrome (6642850582466).

The spelling of 1221400541245 in words is "one trillion, two hundred twenty-one billion, four hundred million, five hundred forty-one thousand, two hundred forty-five".