154512011221 has 2 divisors, whose sum is σ = 154512011222. Its totient is φ = 154512011220.

The previous prime is 154512011219. The next prime is 154512011239. The reversal of 154512011221 is 122110215451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133915743025 + 20596268196 = 365945^2 + 143514^2 .

It is a cyclic number.

It is not a de Polignac number, because 154512011221 - 2¹ = 154512011219 is a prime.

It is a super-2 number, since 2×154512011221² (a number of 23 digits) contains 22 as substring.

Together with 154512011219, 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 (154512011921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77256005610 + 77256005611.

It is an arithmetic number, because the mean of its divisors is an integer number (77256005611).

Almost surely, 2^154512011221 is an apocalyptic number.

It is an amenable number.

154512011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

154512011221 is an equidigital number, since it uses as much as digits as its factorization.

154512011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 25.

Adding to 154512011221 its reverse (122110215451), we get a palindrome (276622226672).

The spelling of 154512011221 in words is "one hundred fifty-four billion, five hundred twelve million, eleven thousand, two hundred twenty-one".