51244042415621 has 16 divisors (see below), whose sum is σ = 59191356019968. Its totient is φ = 43844891059200.

The previous prime is 51244042415569. The next prime is 51244042415623. The reversal of 51244042415621 is 12651424044215.

It is not a de Polignac number, because 51244042415621 - 2⁶ = 51244042415557 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 (51244042415623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31885181 + ... + 33453741.

It is an arithmetic number, because the mean of its divisors is an integer number (3699459751248).

Almost surely, 2^{51244042415621} is an apocalyptic number.

It is an amenable number.

51244042415621 is a deficient number, since it is larger than the sum of its proper divisors (7947313604347).

51244042415621 is a wasteful number, since it uses less digits than its factorization.

51244042415621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743292.

The product of its (nonzero) digits is 307200, while the sum is 41.

Adding to 51244042415621 its reverse (12651424044215), we get a palindrome (63895466459836).

The spelling of 51244042415621 in words is "fifty-one trillion, two hundred forty-four billion, forty-two million, four hundred fifteen thousand, six hundred twenty-one".