102551125421 has 2 divisors, whose sum is σ = 102551125422. Its totient is φ = 102551125420.

The previous prime is 102551125393. The next prime is 102551125519. The reversal of 102551125421 is 124521155201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63801202921 + 38749922500 = 252589^2 + 196850^2 .

It is an emirp because it is prime and its reverse (124521155201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102551125421 is a prime.

It is a super-2 number, since 2×102551125421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102551125921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51275562710 + 51275562711.

It is an arithmetic number, because the mean of its divisors is an integer number (51275562711).

Almost surely, 2^102551125421 is an apocalyptic number.

It is an amenable number.

102551125421 is a deficient number, since it is larger than the sum of its proper divisors (1).

102551125421 is an equidigital number, since it uses as much as digits as its factorization.

102551125421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 29.

The spelling of 102551125421 in words is "one hundred two billion, five hundred fifty-one million, one hundred twenty-five thousand, four hundred twenty-one".