1221002102 has 8 divisors (see below), whose sum is σ = 1835175000. Its totient is φ = 609277104.

The previous prime is 1221002087. The next prime is 1221002141. The reversal of 1221002102 is 2012001221.

It is a happy number.

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

It is a super-2 number, since 2×1221002102² = 2981692266176836808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610727 + ... + 612722.

It is an arithmetic number, because the mean of its divisors is an integer number (229396875).

Almost surely, 2^1221002102 is an apocalyptic number.

1221002102 is a deficient number, since it is larger than the sum of its proper divisors (614172898).

1221002102 is a wasteful number, since it uses less digits than its factorization.

1221002102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223950.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221002102 is about 34942.8404970174. The cubic root of 1221002102 is about 1068.8222117709.

Adding to 1221002102 its reverse (2012001221), we get a palindrome (3233003323).

The spelling of 1221002102 in words is "one billion, two hundred twenty-one million, two thousand, one hundred two".