55129258421 has 4 divisors (see below), whose sum is σ = 55279474752. Its totient is φ = 54979042092.

The previous prime is 55129258399. The next prime is 55129258489. The reversal of 55129258421 is 12485292155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55129258421 - 2⁶ = 55129258357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55129258021) 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, 75107615 + ... + 75108348.

It is an arithmetic number, because the mean of its divisors is an integer number (13819868688).

Almost surely, 2^55129258421 is an apocalyptic number.

It is an amenable number.

55129258421 is a deficient number, since it is larger than the sum of its proper divisors (150216331).

55129258421 is a wasteful number, since it uses less digits than its factorization.

55129258421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150216330.

The product of its digits is 288000, while the sum is 44.

The spelling of 55129258421 in words is "fifty-five billion, one hundred twenty-nine million, two hundred fifty-eight thousand, four hundred twenty-one".