3219649921 has 8 divisors (see below), whose sum is σ = 3389670080. Its totient is φ = 3049686288.

The previous prime is 3219649903. The next prime is 3219649973. The reversal of 3219649921 is 1299469123.

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 3219649921 - 2⁹ = 3219649409 is a prime.

It is a super-2 number, since 2×3219649921² = 20732291227590612482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3219649991) 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, 154495 + ... + 174091.

It is an arithmetic number, because the mean of its divisors is an integer number (423708760).

Almost surely, 2^3219649921 is an apocalyptic number.

It is an amenable number.

3219649921 is a deficient number, since it is larger than the sum of its proper divisors (170020159).

3219649921 is a wasteful number, since it uses less digits than its factorization.

3219649921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28263.

The product of its digits is 209952, while the sum is 46.

The square root of 3219649921 is about 56741.9590867288. The cubic root of 3219649921 is about 1476.6227351542.

The spelling of 3219649921 in words is "three billion, two hundred nineteen million, six hundred forty-nine thousand, nine hundred twenty-one".