221212111002 has 8 divisors (see below), whose sum is σ = 442424222016. Its totient is φ = 73737370332.

The previous prime is 221212110997. The next prime is 221212111007. The reversal of 221212111002 is 200111212122.

It is an interprime number because it is at equal distance from previous prime (221212110997) and next prime (221212111007).

It is a sphenic number, since it is the product of 3 distinct primes.

221212111002 is an admirable number.

It is a super-2 number, since 2×221212111002² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221212111007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18434342578 + ... + 18434342589.

It is an arithmetic number, because the mean of its divisors is an integer number (55303027752).

Almost surely, 2^221212111002 is an apocalyptic number.

221212111002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221212111002 is a wasteful number, since it uses less digits than its factorization.

221212111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36868685172.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221212111002 its reverse (200111212122), we get a palindrome (421323323124).

The spelling of 221212111002 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, two".