102011992821 has 12 divisors (see below), whose sum is σ = 147354564448. Its totient is φ = 68006191464.

The previous prime is 102011992787. The next prime is 102011992829. The reversal of 102011992821 is 128299110201.

It is not a de Polignac number, because 102011992821 - 2⁹ = 102011992309 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 (102011992829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269616 + ... + 526038.

Almost surely, 2^102011992821 is an apocalyptic number.

It is an amenable number.

102011992821 is a deficient number, since it is larger than the sum of its proper divisors (45342571627).

102011992821 is a wasteful number, since it uses less digits than its factorization.

102011992821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300632 (or 300629 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The spelling of 102011992821 in words is "one hundred two billion, eleven million, nine hundred ninety-two thousand, eight hundred twenty-one".