201121601055157 has 4 divisors (see below), whose sum is σ = 201134804090220. Its totient is φ = 201108398020096.

The previous prime is 201121601055121. The next prime is 201121601055211. The reversal of 201121601055157 is 751550106121102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12484533955716 + 188637067099441 = 3533346^2 + 13734521^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121601055157 - 2²³ = 201121592666549 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 (201121601055257) 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, 6601494682 + ... + 6601525147.

It is an arithmetic number, because the mean of its divisors is an integer number (50283701022555).

Almost surely, 2^{201121601055157} is an apocalyptic number.

It is an amenable number.

201121601055157 is a deficient number, since it is larger than the sum of its proper divisors (13203035063).

201121601055157 is a wasteful number, since it uses less digits than its factorization.

201121601055157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13203035062.

The product of its (nonzero) digits is 21000, while the sum is 37.

Adding to 201121601055157 its reverse (751550106121102), we get a palindrome (952671707176259).

The spelling of 201121601055157 in words is "two hundred one trillion, one hundred twenty-one billion, six hundred one million, fifty-five thousand, one hundred fifty-seven".