102521354661 has 24 divisors (see below), whose sum is σ = 164286925920. Its totient is φ = 61081029600.

The previous prime is 102521354581. The next prime is 102521354707. The reversal of 102521354661 is 166453125201.

102521354661 is a `hidden beast` number, since 1 + 0 + 2 + 52 + 1 + 3 + 546 + 61 = 666.

It is not a de Polignac number, because 102521354661 - 2¹¹ = 102521352613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102521358661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8770170 + ... + 8781851.

It is an arithmetic number, because the mean of its divisors is an integer number (6845288580).

Almost surely, 2^102521354661 is an apocalyptic number.

102521354661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102521354661 is a deficient number, since it is larger than the sum of its proper divisors (61765571259).

102521354661 is a wasteful number, since it uses less digits than its factorization.

102521354661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17552097 (or 17552094 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 102521354661 its reverse (166453125201), we get a palindrome (268974479862).

The spelling of 102521354661 in words is "one hundred two billion, five hundred twenty-one million, three hundred fifty-four thousand, six hundred sixty-one".