201121211087 has 2 divisors, whose sum is σ = 201121211088. Its totient is φ = 201121211086.

The previous prime is 201121211029. The next prime is 201121211099. The reversal of 201121211087 is 780112121102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201121211087 - 2¹² = 201121206991 is a prime.

It is a super-2 number, since 2×201121211087² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121211287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560605543 + 100560605544.

It is an arithmetic number, because the mean of its divisors is an integer number (100560605544).

Almost surely, 2^201121211087 is an apocalyptic number.

201121211087 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121211087 is an equidigital number, since it uses as much as digits as its factorization.

201121211087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 201121211087 its reverse (780112121102), we get a palindrome (981233332189).

The spelling of 201121211087 in words is "two hundred one billion, one hundred twenty-one million, two hundred eleven thousand, eighty-seven".