1211001021151 has 2 divisors, whose sum is σ = 1211001021152. Its totient is φ = 1211001021150.

The previous prime is 1211001021149. The next prime is 1211001021259. The reversal of 1211001021151 is 1511201001121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211001021151 - 2¹ = 1211001021149 is a prime.

Together with 1211001021149, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211001021551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500510575 + 605500510576.

It is an arithmetic number, because the mean of its divisors is an integer number (605500510576).

Almost surely, 2^{1211001021151} is an apocalyptic number.

1211001021151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211001021151 is an equidigital number, since it uses as much as digits as its factorization.

1211001021151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 1211001021151 its reverse (1511201001121), we get a palindrome (2722202022272).

The spelling of 1211001021151 in words is "one trillion, two hundred eleven billion, one million, twenty-one thousand, one hundred fifty-one".