51452005421 has 4 divisors (see below), whose sum is σ = 51453829152. Its totient is φ = 51450181692.

The previous prime is 51452005403. The next prime is 51452005457. The reversal of 51452005421 is 12450025415.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12450025415 = 5 ⋅2490005083.

It is a cyclic number.

It is not a de Polignac number, because 51452005421 - 2¹⁰ = 51452004397 is a prime.

It is a super-2 number, since 2×51452005421² (a number of 22 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 (51452005321) 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, 868871 + ... + 926196.

It is an arithmetic number, because the mean of its divisors is an integer number (12863457288).

Almost surely, 2^51452005421 is an apocalyptic number.

It is an amenable number.

51452005421 is a deficient number, since it is larger than the sum of its proper divisors (1823731).

51452005421 is a wasteful number, since it uses less digits than its factorization.

51452005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823730.

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 51452005421 in words is "fifty-one billion, four hundred fifty-two million, five thousand, four hundred twenty-one".