5451821421 has 4 divisors (see below), whose sum is σ = 7269095232. Its totient is φ = 3634547612.

The previous prime is 5451821393. The next prime is 5451821467. The reversal of 5451821421 is 1241281545.

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 5451821421 - 2¹⁵ = 5451788653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5451821471) 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, 908636901 + ... + 908636906.

It is an arithmetic number, because the mean of its divisors is an integer number (1817273808).

Almost surely, 2^5451821421 is an apocalyptic number.

It is an amenable number.

5451821421 is a deficient number, since it is larger than the sum of its proper divisors (1817273811).

5451821421 is a wasteful number, since it uses less digits than its factorization.

5451821421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817273810.

The product of its digits is 12800, while the sum is 33.

The square root of 5451821421 is about 73836.4504902558. The cubic root of 5451821421 is about 1760.0048877490.

The spelling of 5451821421 in words is "five billion, four hundred fifty-one million, eight hundred twenty-one thousand, four hundred twenty-one".