21034106509 has 8 divisors (see below), whose sum is σ = 22693993112. Its totient is φ = 19380202560.

The previous prime is 21034106501. The next prime is 21034106519. The reversal of 21034106509 is 90560143012.

It can be written as a sum of positive squares in 4 ways, for example, as 1632402409 + 19401704100 = 40403^2 + 139290^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21034106509 - 2³ = 21034106501 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 (21034106501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488354 + ... + 1502419.

It is an arithmetic number, because the mean of its divisors is an integer number (2836749139).

Almost surely, 2^21034106509 is an apocalyptic number.

It is an amenable number.

21034106509 is a deficient number, since it is larger than the sum of its proper divisors (1659886603).

21034106509 is a wasteful number, since it uses less digits than its factorization.

21034106509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991327.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 21034106509 in words is "twenty-one billion, thirty-four million, one hundred six thousand, five hundred nine".