21211503499 has 8 divisors (see below), whose sum is σ = 22355514000. Its totient is φ = 20070254592.

The previous prime is 21211503479. The next prime is 21211503571. The reversal of 21211503499 is 99430511212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211503499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211503409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674614 + ... + 705355.

It is an arithmetic number, because the mean of its divisors is an integer number (2794439250).

Almost surely, 2^21211503499 is an apocalyptic number.

21211503499 is a deficient number, since it is larger than the sum of its proper divisors (1144010501).

21211503499 is a wasteful number, since it uses less digits than its factorization.

21211503499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380797.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 21211503499 in words is "twenty-one billion, two hundred eleven million, five hundred three thousand, four hundred ninety-nine".