1221021142253 has 8 divisors (see below), whose sum is σ = 1346989616640. Its totient is φ = 1097547093280.

The previous prime is 1221021142249. The next prime is 1221021142261. The reversal of 1221021142253 is 3522411201221.

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

It is not a de Polignac number, because 1221021142253 - 2² = 1221021142249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021141253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623605325 + ... + 623607282.

It is an arithmetic number, because the mean of its divisors is an integer number (168373702080).

Almost surely, 2^{1221021142253} is an apocalyptic number.

It is an amenable number.

1221021142253 is a deficient number, since it is larger than the sum of its proper divisors (125968474387).

1221021142253 is a wasteful number, since it uses less digits than its factorization.

1221021142253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247212707.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 1221021142253 its reverse (3522411201221), we get a palindrome (4743432343474).

The spelling of 1221021142253 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred forty-two thousand, two hundred fifty-three".