1221402253141 has 4 divisors (see below), whose sum is σ = 1395888289312. Its totient is φ = 1046916216972.

The previous prime is 1221402253133. The next prime is 1221402253187. The reversal of 1221402253141 is 1413522041221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221402253141 - 2³ = 1221402253133 is a prime.

It is a super-2 number, since 2×1221402253141² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221402253121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87243018075 + ... + 87243018088.

It is an arithmetic number, because the mean of its divisors is an integer number (348972072328).

Almost surely, 2^{1221402253141} is an apocalyptic number.

It is an amenable number.

1221402253141 is a deficient number, since it is larger than the sum of its proper divisors (174486036171).

1221402253141 is an equidigital number, since it uses as much as digits as its factorization.

1221402253141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174486036170.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 1221402253141 its reverse (1413522041221), we get a palindrome (2634924294362).

The spelling of 1221402253141 in words is "one trillion, two hundred twenty-one billion, four hundred two million, two hundred fifty-three thousand, one hundred forty-one".