55421154421 has 4 divisors (see below), whose sum is σ = 55422846700. Its totient is φ = 55419462144.

The previous prime is 55421154391. The next prime is 55421154457. The reversal of 55421154421 is 12445112455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12445112455 = 5 ⋅2489022491.

It can be written as a sum of positive squares in 2 ways, for example, as 36829831921 + 18591322500 = 191911^2 + 136350^2 .

It is a cyclic number.

It is not a de Polignac number, because 55421154421 - 2⁵ = 55421154389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55421154491) 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, 796026 + ... + 862843.

It is an arithmetic number, because the mean of its divisors is an integer number (13855711675).

Almost surely, 2^55421154421 is an apocalyptic number.

It is an amenable number.

55421154421 is a deficient number, since it is larger than the sum of its proper divisors (1692279).

55421154421 is a wasteful number, since it uses less digits than its factorization.

55421154421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692278.

The product of its digits is 32000, while the sum is 34.

Adding to 55421154421 its reverse (12445112455), we get a palindrome (67866266876).

The spelling of 55421154421 in words is "fifty-five billion, four hundred twenty-one million, one hundred fifty-four thousand, four hundred twenty-one".