1221770894 has 4 divisors (see below), whose sum is σ = 1832656344. Its totient is φ = 610885446.

The previous prime is 1221770887. The next prime is 1221770903. The reversal of 1221770894 is 4980771221.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305442722 + ... + 305442725.

It is an arithmetic number, because the mean of its divisors is an integer number (458164086).

Almost surely, 2^1221770894 is an apocalyptic number.

1221770894 is a deficient number, since it is larger than the sum of its proper divisors (610885450).

1221770894 is an equidigital number, since it uses as much as digits as its factorization.

1221770894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610885449.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1221770894 is about 34953.8394743696. The cubic root of 1221770894 is about 1069.0464891810.

The spelling of 1221770894 in words is "one billion, two hundred twenty-one million, seven hundred seventy thousand, eight hundred ninety-four".