20211421011 has 4 divisors (see below), whose sum is σ = 26948561352. Its totient is φ = 13474280672.

The previous prime is 20211421007. The next prime is 20211421039. The reversal of 20211421011 is 11012411202.

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 20211421011 - 2² = 20211421007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20211421001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368570166 + ... + 3368570171.

It is an arithmetic number, because the mean of its divisors is an integer number (6737140338).

Almost surely, 2^20211421011 is an apocalyptic number.

20211421011 is a deficient number, since it is larger than the sum of its proper divisors (6737140341).

20211421011 is an equidigital number, since it uses as much as digits as its factorization.

20211421011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737140340.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20211421011 its reverse (11012411202), we get a palindrome (31223832213).

The spelling of 20211421011 in words is "twenty billion, two hundred eleven million, four hundred twenty-one thousand, eleven".