21038952007 has 4 divisors (see below), whose sum is σ = 21044612880. Its totient is φ = 21033291136.

The previous prime is 21038951993. The next prime is 21038952017. The reversal of 21038952007 is 70025983012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21038952007 - 2³¹ = 18891468359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038952017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2824858 + ... + 2832295.

It is an arithmetic number, because the mean of its divisors is an integer number (5261153220).

Almost surely, 2^21038952007 is an apocalyptic number.

21038952007 is a deficient number, since it is larger than the sum of its proper divisors (5660873).

21038952007 is an equidigital number, since it uses as much as digits as its factorization.

21038952007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660872.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 21038952007 in words is "twenty-one billion, thirty-eight million, nine hundred fifty-two thousand, seven".