21213102020 has 24 divisors (see below), whose sum is σ = 48597288768. Its totient is φ = 7713855200.

The previous prime is 21213102017. The next prime is 21213102023. The reversal of 21213102020 is 2020131212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21213102017) and next prime (21213102023).

It is a junction number, because it is equal to n+sod(n) for n = 21213101986 and 21213102004.

It is not an unprimeable number, because it can be changed into a prime (21213102023) 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, 48211376 + ... + 48211815.

It is an arithmetic number, because the mean of its divisors is an integer number (2024887032).

Almost surely, 2^21213102020 is an apocalyptic number.

21213102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213102020 is an abundant number, since it is smaller than the sum of its proper divisors (27384186748).

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

21213102020 is a wasteful number, since it uses less digits than its factorization.

21213102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96423211 (or 96423209 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21213102020 its reverse (2020131212), we get a palindrome (23233233232).

The spelling of 21213102020 in words is "twenty-one billion, two hundred thirteen million, one hundred two thousand, twenty".