55421221353431 has 4 divisors (see below), whose sum is σ = 55421256336600. Its totient is φ = 55421186370264.

The previous prime is 55421221353371. The next prime is 55421221353479. The reversal of 55421221353431 is 13435312212455.

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

It is a cyclic number.

It is not a de Polignac number, because 55421221353431 - 2¹⁰ = 55421221352407 is a prime.

It is a super-2 number, since 2×55421221353431² (a number of 28 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 (55421221353481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14996621 + ... + 18323238.

It is an arithmetic number, because the mean of its divisors is an integer number (13855314084150).

Almost surely, 2^{55421221353431} is an apocalyptic number.

55421221353431 is a deficient number, since it is larger than the sum of its proper divisors (34983169).

55421221353431 is a wasteful number, since it uses less digits than its factorization.

55421221353431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34983168.

The product of its digits is 432000, while the sum is 41.

Adding to 55421221353431 its reverse (13435312212455), we get a palindrome (68856533565886).

The spelling of 55421221353431 in words is "fifty-five trillion, four hundred twenty-one billion, two hundred twenty-one million, three hundred fifty-three thousand, four hundred thirty-one".