1221421102 has 8 divisors (see below), whose sum is σ = 1998689112. Its totient is φ = 555191400.

The previous prime is 1221421067. The next prime is 1221421109. The reversal of 1221421102 is 2011241221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221421109) 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, 27759549 + ... + 27759592.

It is an arithmetic number, because the mean of its divisors is an integer number (249836139).

Almost surely, 2^1221421102 is an apocalyptic number.

1221421102 is a deficient number, since it is larger than the sum of its proper divisors (777268010).

1221421102 is a wasteful number, since it uses less digits than its factorization.

1221421102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55519154.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1221421102 is about 34948.8354884680. The cubic root of 1221421102 is about 1068.9444570669.

Adding to 1221421102 its reverse (2011241221), we get a palindrome (3232662323).

The spelling of 1221421102 in words is "one billion, two hundred twenty-one million, four hundred twenty-one thousand, one hundred two".