201312220012154 has 4 divisors (see below), whose sum is σ = 301968330018234. Its totient is φ = 100656110006076.

The previous prime is 201312220012153. The next prime is 201312220012223. The reversal of 201312220012154 is 451210022213102.

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

It can be written as a sum of positive squares in only one way, i.e., 181885061871529 + 19427158140625 = 13486477^2 + 4407625^2 .

It is not an unprimeable number, because it can be changed into a prime (201312220012153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50328055003037 + ... + 50328055003040.

Almost surely, 2^{201312220012154} is an apocalyptic number.

201312220012154 is a deficient number, since it is larger than the sum of its proper divisors (100656110006080).

201312220012154 is a wasteful number, since it uses less digits than its factorization.

201312220012154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100656110006079.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 201312220012154 its reverse (451210022213102), we get a palindrome (652522242225256).

The spelling of 201312220012154 in words is "two hundred one trillion, three hundred twelve billion, two hundred twenty million, twelve thousand, one hundred fifty-four".