1226829721 has 8 divisors (see below), whose sum is σ = 1321592384. Its totient is φ = 1132122960.

The previous prime is 1226829719. The next prime is 1226829733. The reversal of 1226829721 is 1279286221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1226829721 - 2¹ = 1226829719 is a prime.

It is a super-2 number, since 2×1226829721² = 3010222328657875682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226829761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39100 + ... + 63106.

It is an arithmetic number, because the mean of its divisors is an integer number (165199048).

Almost surely, 2^1226829721 is an apocalyptic number.

It is an amenable number.

1226829721 is a deficient number, since it is larger than the sum of its proper divisors (94762663).

1226829721 is a wasteful number, since it uses less digits than its factorization.

1226829721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27951.

The product of its digits is 48384, while the sum is 40.

The square root of 1226829721 is about 35026.1291181312. The cubic root of 1226829721 is about 1070.5199444088.

The spelling of 1226829721 in words is "one billion, two hundred twenty-six million, eight hundred twenty-nine thousand, seven hundred twenty-one".