21210110100128 has 24 divisors (see below), whose sum is σ = 41823580851360. Its totient is φ = 10588248296640.

The previous prime is 21210110100121. The next prime is 21210110100131. The reversal of 21210110100128 is 82100101101212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21210110100121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525190538 + ... + 525230921.

It is an arithmetic number, because the mean of its divisors is an integer number (1742649202140).

Almost surely, 2^{21210110100128} is an apocalyptic number.

It is an amenable number.

21210110100128 is a deficient number, since it is larger than the sum of its proper divisors (20613470751232).

21210110100128 is a wasteful number, since it uses less digits than its factorization.

21210110100128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050422100 (or 1050422092 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

The spelling of 21210110100128 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, one hundred thousand, one hundred twenty-eight".