1221929494 has 8 divisors (see below), whose sum is σ = 1833822648. Its totient is φ = 610655280.

The previous prime is 1221929483. The next prime is 1221929497. The reversal of 1221929494 is 4949291221.

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

It is a super-2 number, since 2×1221929494² = 2986223376614192072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221929494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221929497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149767 + ... + 157714.

It is an arithmetic number, because the mean of its divisors is an integer number (229227831).

Almost surely, 2^1221929494 is an apocalyptic number.

1221929494 is a deficient number, since it is larger than the sum of its proper divisors (611893154).

1221929494 is a wasteful number, since it uses less digits than its factorization.

1221929494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309470.

The product of its digits is 93312, while the sum is 43.

The square root of 1221929494 is about 34956.1081071678. The cubic root of 1221929494 is about 1069.0927453812.

The spelling of 1221929494 in words is "one billion, two hundred twenty-one million, nine hundred twenty-nine thousand, four hundred ninety-four".