21121010102020 has 24 divisors (see below), whose sum is σ = 45297825922944. Its totient is φ = 8268650762976.

The previous prime is 21121010102009. The next prime is 21121010102039. The reversal of 21121010102020 is 2020101012112.

It is a super-3 number, since 3×21121010102020³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11234578902 + ... + 11234580781.

It is an arithmetic number, because the mean of its divisors is an integer number (1887409413456).

Almost surely, 2^{21121010102020} is an apocalyptic number.

21121010102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121010102020 is an abundant number, since it is smaller than the sum of its proper divisors (24176815820924).

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

21121010102020 is a wasteful number, since it uses less digits than its factorization.

21121010102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22469159739 (or 22469159737 counting only the distinct ones).

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

Adding to 21121010102020 its reverse (2020101012112), we get a palindrome (23141111114132).

The spelling of 21121010102020 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, one hundred two thousand, twenty".