154221214254431 has 4 divisors (see below), whose sum is σ = 154222734031272. Its totient is φ = 154219694477592.

The previous prime is 154221214254413. The next prime is 154221214254433. The reversal of 154221214254431 is 134452412122451.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154221214254431 is a prime.

It is a super-2 number, since 2×154221214254431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154221214254433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759736196 + ... + 759939161.

It is an arithmetic number, because the mean of its divisors is an integer number (38555683507818).

Almost surely, 2^{154221214254431} is an apocalyptic number.

154221214254431 is a deficient number, since it is larger than the sum of its proper divisors (1519776841).

154221214254431 is a wasteful number, since it uses less digits than its factorization.

154221214254431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519776840.

The product of its digits is 307200, while the sum is 41.

Adding to 154221214254431 its reverse (134452412122451), we get a palindrome (288673626376882).

The spelling of 154221214254431 in words is "one hundred fifty-four trillion, two hundred twenty-one billion, two hundred fourteen million, two hundred fifty-four thousand, four hundred thirty-one".