121021057157 has 24 divisors (see below), whose sum is σ = 165391424352. Its totient is φ = 87048108000.

The previous prime is 121021057153. The next prime is 121021057229. The reversal of 121021057157 is 751750120121.

It is not a de Polignac number, because 121021057157 - 2² = 121021057153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021057153) 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 23 ways as a sum of consecutive naturals, for example, 8628719 + ... + 8642732.

It is an arithmetic number, because the mean of its divisors is an integer number (6891309348).

Almost surely, 2^121021057157 is an apocalyptic number.

It is an amenable number.

121021057157 is a deficient number, since it is larger than the sum of its proper divisors (44370367195).

121021057157 is a wasteful number, since it uses less digits than its factorization.

121021057157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17271489 (or 17271482 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 32.

Adding to 121021057157 its reverse (751750120121), we get a palindrome (872771177278).

The spelling of 121021057157 in words is "one hundred twenty-one billion, twenty-one million, fifty-seven thousand, one hundred fifty-seven".