102021211987 has 16 divisors (see below), whose sum is σ = 112731010560. Its totient is φ = 91895772672.

The previous prime is 102021211973. The next prime is 102021212003. The reversal of 102021211987 is 789112120201.

It is a cyclic number.

It is not a de Polignac number, because 102021211987 - 2¹⁵ = 102021179219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102021211907) 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, 625998 + ... + 771955.

It is an arithmetic number, because the mean of its divisors is an integer number (7045688160).

Almost surely, 2^102021211987 is an apocalyptic number.

102021211987 is a deficient number, since it is larger than the sum of its proper divisors (10709798573).

102021211987 is a wasteful number, since it uses less digits than its factorization.

102021211987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398162.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 102021211987 in words is "one hundred two billion, twenty-one million, two hundred eleven thousand, nine hundred eighty-seven".