1221901084 has 12 divisors (see below), whose sum is σ = 2207305408. Its totient is φ = 591242400.

The previous prime is 1221901073. The next prime is 1221901099. The reversal of 1221901084 is 4801091221.

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, 4926897 + ... + 4927144.

Almost surely, 2^1221901084 is an apocalyptic number.

It is an amenable number.

1221901084 is a deficient number, since it is larger than the sum of its proper divisors (985404324).

1221901084 is a wasteful number, since it uses less digits than its factorization.

1221901084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854076 (or 9854074 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1221901084 is about 34955.7017380570. The cubic root of 1221901084 is about 1069.0844598075.

The spelling of 1221901084 in words is "one billion, two hundred twenty-one million, nine hundred one thousand, eighty-four".