51245021353 has 4 divisors (see below), whose sum is σ = 53942127760. Its totient is φ = 48547914948.

The previous prime is 51245021351. The next prime is 51245021363. The reversal of 51245021353 is 35312054215.

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 51245021353 - 2¹ = 51245021351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51245021351) 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, 1348553175 + ... + 1348553212.

It is an arithmetic number, because the mean of its divisors is an integer number (13485531940).

Almost surely, 2^51245021353 is an apocalyptic number.

It is an amenable number.

51245021353 is a deficient number, since it is larger than the sum of its proper divisors (2697106407).

51245021353 is a wasteful number, since it uses less digits than its factorization.

51245021353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697106406.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 51245021353 its reverse (35312054215), we get a palindrome (86557075568).

The spelling of 51245021353 in words is "fifty-one billion, two hundred forty-five million, twenty-one thousand, three hundred fifty-three".