102187407721 has 32 divisors (see below), whose sum is σ = 122117603328. Its totient is φ = 83665465920.

The previous prime is 102187407713. The next prime is 102187407727. The reversal of 102187407721 is 127704781201.

It is a cyclic number.

It is not a de Polignac number, because 102187407721 - 2³ = 102187407713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102187407727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27789135 + ... + 27792811.

It is an arithmetic number, because the mean of its divisors is an integer number (3816175104).

Almost surely, 2^102187407721 is an apocalyptic number.

It is an amenable number.

102187407721 is a deficient number, since it is larger than the sum of its proper divisors (19930195607).

102187407721 is a wasteful number, since it uses less digits than its factorization.

102187407721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341.

The product of its (nonzero) digits is 43904, while the sum is 40.

The spelling of 102187407721 in words is "one hundred two billion, one hundred eighty-seven million, four hundred seven thousand, seven hundred twenty-one".