21071105007 has 16 divisors (see below), whose sum is σ = 29110078080. Its totient is φ = 13548752672.

The previous prime is 21071104997. The next prime is 21071105047. The reversal of 21071105007 is 70050117012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21071105007 - 2²² = 21066910703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071105047) 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, 1113693 + ... + 1132454.

It is an arithmetic number, because the mean of its divisors is an integer number (1819379880).

Almost surely, 2^21071105007 is an apocalyptic number.

21071105007 is a deficient number, since it is larger than the sum of its proper divisors (8038973073).

21071105007 is a wasteful number, since it uses less digits than its factorization.

21071105007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246262.

The product of its (nonzero) digits is 490, while the sum is 24.

The spelling of 21071105007 in words is "twenty-one billion, seventy-one million, one hundred five thousand, seven".