20011021121020 has 24 divisors (see below), whose sum is σ = 42343931721168. Its totient is φ = 7943306092800.

The previous prime is 20011021120997. The next prime is 20011021121029. The reversal of 20011021121020 is 2012112011002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011021121029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3818894541 + ... + 3818899780.

It is an arithmetic number, because the mean of its divisors is an integer number (1764330488382).

Almost surely, 2^{20011021121020} is an apocalyptic number.

20011021121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011021121020 is an abundant number, since it is smaller than the sum of its proper divisors (22332910600148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20011021121020 is a wasteful number, since it uses less digits than its factorization.

20011021121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7637794461 (or 7637794459 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011021121020 its reverse (2012112011002), we get a palindrome (22023133132022).

The spelling of 20011021121020 in words is "twenty trillion, eleven billion, twenty-one million, one hundred twenty-one thousand, twenty".