221001221012 has 36 divisors (see below), whose sum is σ = 457808327508. Its totient is φ = 92727782400.

The previous prime is 221001220981. The next prime is 221001221039. The reversal of 221001221012 is 210122100122.

It can be written as a sum of positive squares in 2 ways, for example, as 114383298436 + 106617922576 = 338206^2 + 326524^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17555789 + ... + 17568372.

Almost surely, 2^221001221012 is an apocalyptic number.

221001221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221001221012 is an abundant number, since it is smaller than the sum of its proper divisors (236807106496).

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

221001221012 is a wasteful number, since it uses less digits than its factorization.

221001221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35124200 (or 35124187 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221001221012 its reverse (210122100122), we get a palindrome (431123321134).

The spelling of 221001221012 in words is "two hundred twenty-one billion, one million, two hundred twenty-one thousand, twelve".