20434611421 has 4 divisors (see below), whose sum is σ = 23353841632. Its totient is φ = 17515381212.

The previous prime is 20434611401. The next prime is 20434611433. The reversal of 20434611421 is 12411643402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20434611421 - 2⁷ = 20434611293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20434611421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434611401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1459615095 + ... + 1459615108.

It is an arithmetic number, because the mean of its divisors is an integer number (5838460408).

Almost surely, 2^20434611421 is an apocalyptic number.

It is an amenable number.

20434611421 is a deficient number, since it is larger than the sum of its proper divisors (2919230211).

20434611421 is an equidigital number, since it uses as much as digits as its factorization.

20434611421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919230210.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 20434611421 in words is "twenty billion, four hundred thirty-four million, six hundred eleven thousand, four hundred twenty-one".