102100102021261 has 2 divisors, whose sum is σ = 102100102021262. Its totient is φ = 102100102021260.

The previous prime is 102100102021223. The next prime is 102100102021271. The reversal of 102100102021261 is 162120201001201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102010383800361 + 89718220900 = 10100019^2 + 299530^2 .

It is a cyclic number.

It is not a de Polignac number, because 102100102021261 - 2¹³ = 102100102013069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102100102021271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51050051010630 + 51050051010631.

It is an arithmetic number, because the mean of its divisors is an integer number (51050051010631).

Almost surely, 2^{102100102021261} is an apocalyptic number.

It is an amenable number.

102100102021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

102100102021261 is an equidigital number, since it uses as much as digits as its factorization.

102100102021261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 102100102021261 its reverse (162120201001201), we get a palindrome (264220303022462).

The spelling of 102100102021261 in words is "one hundred two trillion, one hundred billion, one hundred two million, twenty-one thousand, two hundred sixty-one".