1221020102 has 8 divisors (see below), whose sum is σ = 1832640456. Its totient is φ = 610139952.

The previous prime is 1221020093. The next prime is 1221020111. The reversal of 1221020102 is 2010201221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221020093) and next prime (1221020111).

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

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, 180908 + ... + 187535.

It is an arithmetic number, because the mean of its divisors is an integer number (229080057).

Almost surely, 2^1221020102 is an apocalyptic number.

1221020102 is a deficient number, since it is larger than the sum of its proper divisors (611620354).

1221020102 is a wasteful number, since it uses less digits than its factorization.

1221020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370102.

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

The square root of 1221020102 is about 34943.0980595596. The cubic root of 1221020102 is about 1068.8274639337.

Adding to 1221020102 its reverse (2010201221), we get a palindrome (3231221323).

The spelling of 1221020102 in words is "one billion, two hundred twenty-one million, twenty thousand, one hundred two".