21212002000020 has 48 divisors (see below), whose sum is σ = 63962344494720. Its totient is φ = 5221415876736.

The previous prime is 21212001999997. The next prime is 21212002000037. The reversal of 21212002000020 is 2000020021212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13597436400 + ... + 13597437959.

It is an arithmetic number, because the mean of its divisors is an integer number (1332548843640).

Almost surely, 2^{21212002000020} is an apocalyptic number.

21212002000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212002000020 is an abundant number, since it is smaller than the sum of its proper divisors (42750342494700).

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

21212002000020 is a wasteful number, since it uses less digits than its factorization.

21212002000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27194874384 (or 27194874382 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21212002000020 its reverse (2000020021212), we get a palindrome (23212022021232).

The spelling of 21212002000020 in words is "twenty-one trillion, two hundred twelve billion, two million, twenty", and thus it is an aban number.