20521214411 has 4 divisors (see below), whose sum is σ = 20857627824. Its totient is φ = 20184801000.

The previous prime is 20521214393. The next prime is 20521214449. The reversal of 20521214411 is 11441212502.

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 20521214411 - 2¹⁸ = 20520952267 is a prime.

It is a super-2 number, since 2×20521214411² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20521214011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168206615 + ... + 168206736.

It is an arithmetic number, because the mean of its divisors is an integer number (5214406956).

Almost surely, 2^20521214411 is an apocalyptic number.

20521214411 is a deficient number, since it is larger than the sum of its proper divisors (336413413).

20521214411 is an equidigital number, since it uses as much as digits as its factorization.

20521214411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336413412.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 20521214411 its reverse (11441212502), we get a palindrome (31962426913).

The spelling of 20521214411 in words is "twenty billion, five hundred twenty-one million, two hundred fourteen thousand, four hundred eleven".