20434303011021 has 16 divisors (see below), whose sum is σ = 28781786619840. Its totient is φ = 12859947192960.

The previous prime is 20434303010981. The next prime is 20434303011071. The reversal of 20434303011021 is 12011030343402.

It is a happy number.

It is not a de Polignac number, because 20434303011021 - 2³⁷ = 20296864057549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20434303010982 and 20434303011000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434303011071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637878190 + ... + 637910223.

It is an arithmetic number, because the mean of its divisors is an integer number (1798861663740).

Almost surely, 2^{20434303011021} is an apocalyptic number.

It is an amenable number.

20434303011021 is a deficient number, since it is larger than the sum of its proper divisors (8347483608819).

20434303011021 is a wasteful number, since it uses less digits than its factorization.

20434303011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275788716.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 20434303011021 its reverse (12011030343402), we get a palindrome (32445333354423).

The spelling of 20434303011021 in words is "twenty trillion, four hundred thirty-four billion, three hundred three million, eleven thousand, twenty-one".