20234405021 has 2 divisors, whose sum is σ = 20234405022. Its totient is φ = 20234405020.

The previous prime is 20234404991. The next prime is 20234405029. The reversal of 20234405021 is 12050443202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17007028921 + 3227376100 = 130411^2 + 56810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20234405021 is a prime.

It is a super-2 number, since 2×20234405021² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20234405029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117202510 + 10117202511.

It is an arithmetic number, because the mean of its divisors is an integer number (10117202511).

Almost surely, 2^20234405021 is an apocalyptic number.

It is an amenable number.

20234405021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20234405021 is an equidigital number, since it uses as much as digits as its factorization.

20234405021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 20234405021 its reverse (12050443202), we get a palindrome (32284848223).

It can be divided in two parts, 2023 and 4405021, that added together give a palindrome (4407044).

The spelling of 20234405021 in words is "twenty billion, two hundred thirty-four million, four hundred five thousand, twenty-one".