20340120021 has 64 divisors (see below), whose sum is σ = 31294771200. Its totient is φ = 11659785984.

The previous prime is 20340120019. The next prime is 20340120041. The reversal of 20340120021 is 12002104302.

It is not a de Polignac number, because 20340120021 - 2¹ = 20340120019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340120041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4034020 + ... + 4039058.

It is an arithmetic number, because the mean of its divisors is an integer number (488980800).

Almost surely, 2^20340120021 is an apocalyptic number.

It is an amenable number.

20340120021 is a deficient number, since it is larger than the sum of its proper divisors (10954651179).

20340120021 is a wasteful number, since it uses less digits than its factorization.

20340120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5210.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20340120021 its reverse (12002104302), we get a palindrome (32342224323).

The spelling of 20340120021 in words is "twenty billion, three hundred forty million, one hundred twenty thousand, twenty-one".