1222887721 has 16 divisors (see below), whose sum is σ = 1393717248. Its totient is φ = 1062867600.

The previous prime is 1222887697. The next prime is 1222887733. The reversal of 1222887721 is 1277882221.

It is a cyclic number.

It is not a de Polignac number, because 1222887721 - 2¹³ = 1222879529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222887521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6700 + ... + 49906.

It is an arithmetic number, because the mean of its divisors is an integer number (87107328).

Almost surely, 2^1222887721 is an apocalyptic number.

1222887721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222887721 is a deficient number, since it is larger than the sum of its proper divisors (170829527).

1222887721 is a wasteful number, since it uses less digits than its factorization.

1222887721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43332.

The product of its digits is 50176, while the sum is 40.

The square root of 1222887721 is about 34969.8115665498. The cubic root of 1222887721 is about 1069.3721302588.

The spelling of 1222887721 in words is "one billion, two hundred twenty-two million, eight hundred eighty-seven thousand, seven hundred twenty-one".