1221022153139 has 8 divisors (see below), whose sum is σ = 1227112837200. Its totient is φ = 1214934336000.

The previous prime is 1221022153103. The next prime is 1221022153151. The reversal of 1221022153139 is 9313512201221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221022153139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223022153139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139739 + ... + 1568939.

It is an arithmetic number, because the mean of its divisors is an integer number (153389104650).

Almost surely, 2^{1221022153139} is an apocalyptic number.

1221022153139 is a deficient number, since it is larger than the sum of its proper divisors (6090684061).

1221022153139 is a wasteful number, since it uses less digits than its factorization.

1221022153139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433461.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 1221022153139 in words is "one trillion, two hundred twenty-one billion, twenty-two million, one hundred fifty-three thousand, one hundred thirty-nine".