21107021035 has 8 divisors (see below), whose sum is σ = 25589543616. Its totient is φ = 16711537920.

The previous prime is 21107021027. The next prime is 21107021063. The reversal of 21107021035 is 53012070112.

It is a happy number.

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

It is not a de Polignac number, because 21107021035 - 2³ = 21107021027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21107020997 and 21107021015.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21759331 + ... + 21760300.

It is an arithmetic number, because the mean of its divisors is an integer number (3198692952).

Almost surely, 2^21107021035 is an apocalyptic number.

21107021035 is a deficient number, since it is larger than the sum of its proper divisors (4482522581).

21107021035 is an equidigital number, since it uses as much as digits as its factorization.

21107021035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43519733.

The product of its (nonzero) digits is 420, while the sum is 22.

Adding to 21107021035 its reverse (53012070112), we get a palindrome (74119091147).

The spelling of 21107021035 in words is "twenty-one billion, one hundred seven million, twenty-one thousand, thirty-five".