102500020261 has 16 divisors (see below), whose sum is σ = 106028392320. Its totient is φ = 99033923520.

The previous prime is 102500020219. The next prime is 102500020307. The reversal of 102500020261 is 162020005201.

It is a cyclic number.

It is not a de Polignac number, because 102500020261 - 2¹⁷ = 102499889189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102500020061) 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, 4931056 + ... + 4951798.

It is an arithmetic number, because the mean of its divisors is an integer number (6626774520).

Almost surely, 2^102500020261 is an apocalyptic number.

It is an amenable number.

102500020261 is a deficient number, since it is larger than the sum of its proper divisors (3528372059).

102500020261 is a wasteful number, since it uses less digits than its factorization.

102500020261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22236.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 102500020261 its reverse (162020005201), we get a palindrome (264520025462).

The spelling of 102500020261 in words is "one hundred two billion, five hundred million, twenty thousand, two hundred sixty-one".