21212011020220 has 12 divisors (see below), whose sum is σ = 44545223142504. Its totient is φ = 8484804408080.

The previous prime is 21212011020209. The next prime is 21212011020247. The reversal of 21212011020220 is 2202011021212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21212011020194 and 21212011020203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530300275486 + ... + 530300275525.

It is an arithmetic number, because the mean of its divisors is an integer number (3712101928542).

Almost surely, 2^{21212011020220} is an apocalyptic number.

21212011020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212011020220 is an abundant number, since it is smaller than the sum of its proper divisors (23333212122284).

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

21212011020220 is a wasteful number, since it uses less digits than its factorization.

21212011020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060600551020 (or 1060600551018 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212011020220 its reverse (2202011021212), we get a palindrome (23414022041432).

The spelling of 21212011020220 in words is "twenty-one trillion, two hundred twelve billion, eleven million, twenty thousand, two hundred twenty".