21234503215 has 4 divisors (see below), whose sum is σ = 25481403864. Its totient is φ = 16987602568.

The previous prime is 21234503203. The next prime is 21234503219. The reversal of 21234503215 is 51230543212.

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 21234503215 - 2⁵ = 21234503183 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 (21234503219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123450317 + ... + 2123450326.

It is an arithmetic number, because the mean of its divisors is an integer number (6370350966).

Almost surely, 2^21234503215 is an apocalyptic number.

21234503215 is a deficient number, since it is larger than the sum of its proper divisors (4246900649).

21234503215 is an equidigital number, since it uses as much as digits as its factorization.

21234503215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246900648.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21234503215 in words is "twenty-one billion, two hundred thirty-four million, five hundred three thousand, two hundred fifteen".