1221204134 has 8 divisors (see below), whose sum is σ = 1832740560. Its totient is φ = 610290616.

The previous prime is 1221204133. The next prime is 1221204137. The reversal of 1221204134 is 4314021221.

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 (1221204133) 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, 150794 + ... + 158685.

It is an arithmetic number, because the mean of its divisors is an integer number (229092570).

Almost surely, 2^1221204134 is an apocalyptic number.

1221204134 is a deficient number, since it is larger than the sum of its proper divisors (611536426).

1221204134 is a wasteful number, since it uses less digits than its factorization.

1221204134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311454.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221204134 is about 34945.7312700707. The cubic root of 1221204134 is about 1068.8811590842.

Adding to 1221204134 its reverse (4314021221), we get a palindrome (5535225355).

The spelling of 1221204134 in words is "one billion, two hundred twenty-one million, two hundred four thousand, one hundred thirty-four".