1216921822 has 16 divisors (see below), whose sum is σ = 1836450000. Its totient is φ = 604779840.

The previous prime is 1216921799. The next prime is 1216921843. The reversal of 1216921822 is 2281296121.

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, 441304 + ... + 444052.

It is an arithmetic number, because the mean of its divisors is an integer number (114778125).

Almost surely, 2^1216921822 is an apocalyptic number.

1216921822 is a deficient number, since it is larger than the sum of its proper divisors (619528178).

1216921822 is a wasteful number, since it uses less digits than its factorization.

1216921822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its digits is 6912, while the sum is 34.

The square root of 1216921822 is about 34884.4065737114. The cubic root of 1216921822 is about 1067.6303053260.

The spelling of 1216921822 in words is "one billion, two hundred sixteen million, nine hundred twenty-one thousand, eight hundred twenty-two".