221212021200020 has 48 divisors (see below), whose sum is σ = 476979736859136. Its totient is φ = 86126348448000.

The previous prime is 221212021200013. The next prime is 221212021200091. The reversal of 221212021200020 is 20002120212122.

It is a happy number.

221212021200020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 312605696 + ... + 313312535.

It is an arithmetic number, because the mean of its divisors is an integer number (9937077851232).

Almost surely, 2^{221212021200020} is an apocalyptic number.

221212021200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212021200020 is an abundant number, since it is smaller than the sum of its proper divisors (255767715659116).

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

221212021200020 is a wasteful number, since it uses less digits than its factorization.

221212021200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625918712 (or 625918710 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221212021200020 its reverse (20002120212122), we get a palindrome (241214141412142).

The spelling of 221212021200020 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, two hundred thousand, twenty".