20421300614623 has 2 divisors, whose sum is σ = 20421300614624. Its totient is φ = 20421300614622.

The previous prime is 20421300614597. The next prime is 20421300614639. The reversal of 20421300614623 is 32641600312402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20421300614623 - 2⁹ = 20421300614111 is a prime.

It is a super-2 number, since 2×20421300614623² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20421300614023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210650307311 + 10210650307312.

It is an arithmetic number, because the mean of its divisors is an integer number (10210650307312).

Almost surely, 2^{20421300614623} is an apocalyptic number.

20421300614623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421300614623 is an equidigital number, since it uses as much as digits as its factorization.

20421300614623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 20421300614623 in words is "twenty trillion, four hundred twenty-one billion, three hundred million, six hundred fourteen thousand, six hundred twenty-three".