102101120021 has 16 divisors (see below), whose sum is σ = 107991321600. Its totient is φ = 96263073648.

The previous prime is 102101120003. The next prime is 102101120057. The reversal of 102101120021 is 120021101201.

It is a cyclic number.

It is not a de Polignac number, because 102101120021 - 2³⁴ = 84921250837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102101119984 and 102101120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102101120071) 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, 8472026 + ... + 8484068.

It is an arithmetic number, because the mean of its divisors is an integer number (6749457600).

Almost surely, 2^102101120021 is an apocalyptic number.

It is an amenable number.

102101120021 is a deficient number, since it is larger than the sum of its proper divisors (5890201579).

102101120021 is a wasteful number, since it uses less digits than its factorization.

102101120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14168.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102101120021 its reverse (120021101201), we get a palindrome (222122221222).

The spelling of 102101120021 in words is "one hundred two billion, one hundred one million, one hundred twenty thousand, twenty-one".