51021402223 has 4 divisors (see below), whose sum is σ = 55659711528. Its totient is φ = 46383092920.

The previous prime is 51021402209. The next prime is 51021402253. The reversal of 51021402223 is 32220412015.

It is a happy number.

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 51021402223 - 2²⁵ = 50987847791 is a prime.

It is a super-2 number, since 2×51021402223² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51021402194 and 51021402203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021402253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2319154636 + ... + 2319154657.

It is an arithmetic number, because the mean of its divisors is an integer number (13914927882).

Almost surely, 2^51021402223 is an apocalyptic number.

51021402223 is a deficient number, since it is larger than the sum of its proper divisors (4638309305).

51021402223 is a wasteful number, since it uses less digits than its factorization.

51021402223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4638309304.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 51021402223 its reverse (32220412015), we get a palindrome (83241814238).

The spelling of 51021402223 in words is "fifty-one billion, twenty-one million, four hundred two thousand, two hundred twenty-three".