221020012212 has 48 divisors (see below), whose sum is σ = 530385653952. Its totient is φ = 71594691840.

The previous prime is 221020012207. The next prime is 221020012217. The reversal of 221020012212 is 212210020122.

It is an interprime number because it is at equal distance from previous prime (221020012207) and next prime (221020012217).

It is a junction number, because it is equal to n+sod(n) for n = 221020012191 and 221020012200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020012217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985489 + ... + 1188792.

It is an arithmetic number, because the mean of its divisors is an integer number (11049701124).

Almost surely, 2^221020012212 is an apocalyptic number.

It is an amenable number.

221020012212 is an abundant number, since it is smaller than the sum of its proper divisors (309365641740).

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

221020012212 is a wasteful number, since it uses less digits than its factorization.

221020012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174528 (or 2174526 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221020012212 its reverse (212210020122), we get a palindrome (433230032334).

The spelling of 221020012212 in words is "two hundred twenty-one billion, twenty million, twelve thousand, two hundred twelve".