221212022012010 has 24 divisors (see below), whose sum is σ = 575151257231460. Its totient is φ = 58989872536512.

The previous prime is 221212022011949. The next prime is 221212022012077. The reversal of 221212022012010 is 10210220212122.

It is a happy number.

221212022012010 is a `hidden beast` number, since 221 + 2 + 1 + 20 + 220 + 1 + 201 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 194430869159409 + 26781152852601 = 13943847^2 + 5175051^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1228955677755 + ... + 1228955677934.

Almost surely, 2^{221212022012010} is an apocalyptic number.

221212022012010 is an abundant number, since it is smaller than the sum of its proper divisors (353939235219450).

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

221212022012010 is a wasteful number, since it uses less digits than its factorization.

221212022012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457911355702 (or 2457911355699 counting only the distinct ones).

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

Adding to 221212022012010 its reverse (10210220212122), we get a palindrome (231422242224132).

The spelling of 221212022012010 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-two million, twelve thousand, ten".