1221876814 has 16 divisors (see below), whose sum is σ = 1930006800. Its totient is φ = 578565504.

The previous prime is 1221876809. The next prime is 1221876823. The reversal of 1221876814 is 4186781221.

It is a congruent number.

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, 144742 + ... + 152950.

It is an arithmetic number, because the mean of its divisors is an integer number (120625425).

Almost surely, 2^1221876814 is an apocalyptic number.

1221876814 is a deficient number, since it is larger than the sum of its proper divisors (708129986).

1221876814 is a wasteful number, since it uses less digits than its factorization.

1221876814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12147.

The product of its digits is 43008, while the sum is 40.

The square root of 1221876814 is about 34955.3545826673. The cubic root of 1221876814 is about 1069.0773815337.

The spelling of 1221876814 in words is "one billion, two hundred twenty-one million, eight hundred seventy-six thousand, eight hundred fourteen".