21030503211 has 6 divisors (see below), whose sum is σ = 30377393540. Its totient is φ = 14020335468.

The previous prime is 21030503183. The next prime is 21030503239. The reversal of 21030503211 is 11230503012.

It is an interprime number because it is at equal distance from previous prime (21030503183) and next prime (21030503239).

It is not a de Polignac number, because 21030503211 - 2¹⁵ = 21030470443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030503281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1168361281 + ... + 1168361298.

Almost surely, 2^21030503211 is an apocalyptic number.

21030503211 is a deficient number, since it is larger than the sum of its proper divisors (9346890329).

21030503211 is a wasteful number, since it uses less digits than its factorization.

21030503211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336722585 (or 2336722582 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The spelling of 21030503211 in words is "twenty-one billion, thirty million, five hundred three thousand, two hundred eleven".