51244342101021 has 16 divisors (see below), whose sum is σ = 68566686369984. Its totient is φ = 34042600610304.

The previous prime is 51244342101019. The next prime is 51244342101023. The reversal of 51244342101021 is 12010124344215.

It is an interprime number because it is at equal distance from previous prime (51244342101019) and next prime (51244342101023).

It is not a de Polignac number, because 51244342101021 - 2¹ = 51244342101019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51244342101021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51244342101023) 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, 17961876 + ... + 20618381.

It is an arithmetic number, because the mean of its divisors is an integer number (4285417898124).

Almost surely, 2^{51244342101021} is an apocalyptic number.

It is an amenable number.

51244342101021 is a deficient number, since it is larger than the sum of its proper divisors (17322344268963).

51244342101021 is a wasteful number, since it uses less digits than its factorization.

51244342101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38581820.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 51244342101021 its reverse (12010124344215), we get a palindrome (63254466445236).

The spelling of 51244342101021 in words is "fifty-one trillion, two hundred forty-four billion, three hundred forty-two million, one hundred one thousand, twenty-one".