1002121222221 has 48 divisors (see below), whose sum is σ = 1717822124928. Its totient is φ = 571887475200.

The previous prime is 1002121222187. The next prime is 1002121222231. The reversal of 1002121222221 is 1222221212001.

It is a happy number.

1002121222221 is a `hidden beast` number, since 10 + 0 + 212 + 1 + 222 + 221 = 666.

It is not a de Polignac number, because 1002121222221 - 2⁹ = 1002121221709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002121222194 and 1002121222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002121222231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 907381 + ... + 1681541.

It is an arithmetic number, because the mean of its divisors is an integer number (35787960936).

Almost surely, 2^{1002121222221} is an apocalyptic number.

It is an amenable number.

1002121222221 is a deficient number, since it is larger than the sum of its proper divisors (715700902707).

1002121222221 is an frugal number, since it uses more digits than its factorization.

1002121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774944 (or 774932 counting only the distinct ones).

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

Adding to 1002121222221 its reverse (1222221212001), we get a palindrome (2224342434222).

The spelling of 1002121222221 in words is "one trillion, two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".