1211001022157 has 8 divisors (see below), whose sum is σ = 1275049443360. Its totient is φ = 1146983753520.

The previous prime is 1211001022141. The next prime is 1211001022159. The reversal of 1211001022157 is 7512201001121.

It is a happy number.

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 1211001022157 - 2⁴ = 1211001022141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211001022159) 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, 7708319 + ... + 7863852.

It is an arithmetic number, because the mean of its divisors is an integer number (159381180420).

Almost surely, 2^{1211001022157} is an apocalyptic number.

It is an amenable number.

1211001022157 is a deficient number, since it is larger than the sum of its proper divisors (64048421203).

1211001022157 is a wasteful number, since it uses less digits than its factorization.

1211001022157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15576283.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 1211001022157 its reverse (7512201001121), we get a palindrome (8723202023278).

The spelling of 1211001022157 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, one hundred fifty-seven".