1221372854 has 16 divisors (see below), whose sum is σ = 2089045728. Its totient is φ = 530550912.

The previous prime is 1221372853. The next prime is 1221372913. The reversal of 1221372854 is 4582731221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221372851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381202 + ... + 1382085.

It is an arithmetic number, because the mean of its divisors is an integer number (130565358).

Almost surely, 2^1221372854 is an apocalyptic number.

1221372854 is a deficient number, since it is larger than the sum of its proper divisors (867672874).

1221372854 is a wasteful number, since it uses less digits than its factorization.

1221372854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763319.

The product of its digits is 26880, while the sum is 35.

The square root of 1221372854 is about 34948.1452154474. The cubic root of 1221372854 is about 1068.9303819017.

The spelling of 1221372854 in words is "one billion, two hundred twenty-one million, three hundred seventy-two thousand, eight hundred fifty-four".