221212021201020 has 120 divisors (see below), whose sum is σ = 694109379196464. Its totient is φ = 58976349951744.

The previous prime is 221212021200991. The next prime is 221212021201033. The reversal of 221212021201020 is 20102120212122.

It is a happy number.

221212021201020 is a `hidden beast` number, since 221 + 21 + 202 + 1 + 201 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221212021200984 and 221212021201002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8580649 + ... + 22716768.

Almost surely, 2^{221212021201020} is an apocalyptic number.

221212021201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212021201020 is an abundant number, since it is smaller than the sum of its proper divisors (472897357995444).

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

221212021201020 is a wasteful number, since it uses less digits than its factorization.

221212021201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31301801 (or 31301790 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221212021201020 its reverse (20102120212122), we get a palindrome (241314141413142).

The spelling of 221212021201020 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, two hundred one thousand, twenty".