21053450215 has 8 divisors (see below), whose sum is σ = 28873303200. Its totient is φ = 14436651552.

The previous prime is 21053450191. The next prime is 21053450237. The reversal of 21053450215 is 51205435012.

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 21053450215 - 2¹⁵ = 21053417447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300763540 + ... + 300763609.

It is an arithmetic number, because the mean of its divisors is an integer number (3609162900).

Almost surely, 2^21053450215 is an apocalyptic number.

21053450215 is a deficient number, since it is larger than the sum of its proper divisors (7819852985).

21053450215 is an equidigital number, since it uses as much as digits as its factorization.

21053450215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601527161.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21053450215 its reverse (51205435012), we get a palindrome (72258885227).

The spelling of 21053450215 in words is "twenty-one billion, fifty-three million, four hundred fifty thousand, two hundred fifteen".