9102100021 has 8 divisors (see below), whose sum is σ = 10405226880. Its totient is φ = 7799679888.

The previous prime is 9102100019. The next prime is 9102100027. The reversal of 9102100021 is 1200012019.

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

It is not a de Polignac number, because 9102100021 - 2¹ = 9102100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9102099968 and 9102100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9102100027) 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, 148786 + ... + 200851.

It is an arithmetic number, because the mean of its divisors is an integer number (1300653360).

Almost surely, 2^9102100021 is an apocalyptic number.

It is an amenable number.

9102100021 is a deficient number, since it is larger than the sum of its proper divisors (1303126859).

9102100021 is a wasteful number, since it uses less digits than its factorization.

9102100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353363.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 9102100021 is about 95404.9266075919. The cubic root of 9102100021 is about 2087.9200648001.

The spelling of 9102100021 in words is "nine billion, one hundred two million, one hundred thousand, twenty-one".