2150220521 has 4 divisors (see below), whose sum is σ = 2164460544. Its totient is φ = 2135980500.

The previous prime is 2150220517. The next prime is 2150220529. The reversal of 2150220521 is 1250220512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2150220521 - 2² = 2150220517 is a prime.

It is a super-2 number, since 2×2150220521² = 9246896577859022882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2150220493 and 2150220502.

It is not an unprimeable number, because it can be changed into a prime (2150220529) 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, 7119785 + ... + 7120086.

It is an arithmetic number, because the mean of its divisors is an integer number (541115136).

Almost surely, 2^2150220521 is an apocalyptic number.

It is an amenable number.

2150220521 is a deficient number, since it is larger than the sum of its proper divisors (14240023).

2150220521 is a wasteful number, since it uses less digits than its factorization.

2150220521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14240022.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2150220521 is about 46370.4703556045. The cubic root of 2150220521 is about 1290.7070060289.

Subtracting from 2150220521 its reverse (1250220512), we obtain a palindrome (900000009).

The spelling of 2150220521 in words is "two billion, one hundred fifty million, two hundred twenty thousand, five hundred twenty-one".