1221402234 has 16 divisors (see below), whose sum is σ = 2630712672. Its totient is φ = 375816048.

The previous prime is 1221402223. The next prime is 1221402241. The reversal of 1221402234 is 4322041221.

1221402234 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1221402234.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7829424 + ... + 7829579.

It is an arithmetic number, because the mean of its divisors is an integer number (164419542).

Almost surely, 2^1221402234 is an apocalyptic number.

1221402234 is an abundant number, since it is smaller than the sum of its proper divisors (1409310438).

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

1221402234 is a wasteful number, since it uses less digits than its factorization.

1221402234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15659021.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1221402234 is about 34948.5655499621. The cubic root of 1221402234 is about 1068.9389528369.

Adding to 1221402234 its reverse (4322041221), we get a palindrome (5543443455).

The spelling of 1221402234 in words is "one billion, two hundred twenty-one million, four hundred two thousand, two hundred thirty-four".