51515421101 has 2 divisors, whose sum is σ = 51515421102. Its totient is φ = 51515421100.

The previous prime is 51515421077. The next prime is 51515421119. The reversal of 51515421101 is 10112451515.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49813776100 + 1701645001 = 223190^2 + 41251^2 .

It is a cyclic number.

It is not a de Polignac number, because 51515421101 - 2⁶ = 51515421037 is a prime.

It is a super-2 number, since 2×51515421101² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51515423101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757710550 + 25757710551.

It is an arithmetic number, because the mean of its divisors is an integer number (25757710551).

Almost surely, 2^51515421101 is an apocalyptic number.

It is an amenable number.

51515421101 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515421101 is an equidigital number, since it uses as much as digits as its factorization.

51515421101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 51515421101 its reverse (10112451515), we get a palindrome (61627872616).

The spelling of 51515421101 in words is "fifty-one billion, five hundred fifteen million, four hundred twenty-one thousand, one hundred one".