102111100021 has 8 divisors (see below), whose sum is σ = 116700332480. Its totient is φ = 87522350688.

The previous prime is 102111099967. The next prime is 102111100027. The reversal of 102111100021 is 120001111201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102111100021 - 2¹¹ = 102111097973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102111099980 and 102111100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111100027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 783865 + ... + 904801.

It is an arithmetic number, because the mean of its divisors is an integer number (14587541560).

Almost surely, 2^102111100021 is an apocalyptic number.

It is an amenable number.

102111100021 is a deficient number, since it is larger than the sum of its proper divisors (14589232459).

102111100021 is a wasteful number, since it uses less digits than its factorization.

102111100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241563.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 102111100021 its reverse (120001111201), we get a palindrome (222112211222).

The spelling of 102111100021 in words is "one hundred two billion, one hundred eleven million, one hundred thousand, twenty-one".