3551972921 has 16 divisors (see below), whose sum is σ = 4140592128. Its totient is φ = 2983780800.

The previous prime is 3551972891. The next prime is 3551972951. The reversal of 3551972921 is 1292791553.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3551972891) and next prime (3551972951).

It is not a de Polignac number, because 3551972921 - 2⁶ = 3551972857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3551972951) 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 15 ways as a sum of consecutive naturals, for example, 362831 + ... + 372491.

It is an arithmetic number, because the mean of its divisors is an integer number (258787008).

Almost surely, 2^3551972921 is an apocalyptic number.

It is an amenable number.

3551972921 is a deficient number, since it is larger than the sum of its proper divisors (588619207).

3551972921 is an equidigital number, since it uses as much as digits as its factorization.

3551972921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712.

The product of its digits is 170100, while the sum is 44.

The square root of 3551972921 is about 59598.4305246371. The cubic root of 3551972921 is about 1525.7728478609.

The spelling of 3551972921 in words is "three billion, five hundred fifty-one million, nine hundred seventy-two thousand, nine hundred twenty-one".