20402211021 has 8 divisors (see below), whose sum is σ = 27242318304. Its totient is φ = 13581788880.

The previous prime is 20402211017. The next prime is 20402211043. The reversal of 20402211021 is 12011220402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20402211021 - 2² = 20402211017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402211091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4918866 + ... + 4923011.

It is an arithmetic number, because the mean of its divisors is an integer number (3405289788).

Almost surely, 2^20402211021 is an apocalyptic number.

It is an amenable number.

20402211021 is a deficient number, since it is larger than the sum of its proper divisors (6840107283).

20402211021 is an equidigital number, since it uses as much as digits as its factorization.

20402211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842571.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20402211021 its reverse (12011220402), we get a palindrome (32413431423).

The spelling of 20402211021 in words is "twenty billion, four hundred two million, two hundred eleven thousand, twenty-one".