21010102101009 has 32 divisors (see below), whose sum is σ = 35572937783040. Its totient is φ = 12005678756736.

The previous prime is 21010102101007. The next prime is 21010102101059. The reversal of 21010102101009 is 90010120101012.

It is a happy number.

It is not a de Polignac number, because 21010102101009 - 2¹ = 21010102101007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010102100982 and 21010102101000.

It is not an unprimeable number, because it can be changed into a prime (21010102101007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29095759 + ... + 29809115.

It is an arithmetic number, because the mean of its divisors is an integer number (1111654305720).

Almost surely, 2^{21010102101009} is an apocalyptic number.

It is an amenable number.

21010102101009 is a deficient number, since it is larger than the sum of its proper divisors (14562835682031).

21010102101009 is a wasteful number, since it uses less digits than its factorization.

21010102101009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869206 (or 869200 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 21010102101009 in words is "twenty-one trillion, ten billion, one hundred two million, one hundred one thousand, nine".