2153220521 has 8 divisors (see below), whose sum is σ = 2178524160. Its totient is φ = 2127941728.

The previous prime is 2153220497. The next prime is 2153220533. The reversal of 2153220521 is 1250223512.

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-2153220521 is a prime.

It is a super-2 number, since 2×2153220521² = 9272717224111022882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2153220551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212840 + ... + 222726.

It is an arithmetic number, because the mean of its divisors is an integer number (272315520).

Almost surely, 2^2153220521 is an apocalyptic number.

It is an amenable number.

2153220521 is a deficient number, since it is larger than the sum of its proper divisors (25303639).

2153220521 is an equidigital number, since it uses as much as digits as its factorization.

2153220521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12423.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2153220521 is about 46402.8072534410. The cubic root of 2153220521 is about 1291.3069943515.

The spelling of 2153220521 in words is "two billion, one hundred fifty-three million, two hundred twenty thousand, five hundred twenty-one".