3121401021 has 8 divisors (see below), whose sum is σ = 4162129824. Its totient is φ = 2080803120.

The previous prime is 3121400983. The next prime is 3121401029. The reversal of 3121401021 is 1201041213.

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

It is not a de Polignac number, because 3121401021 - 2¹⁰ = 3121399997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121401029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62515 + ... + 100751.

It is an arithmetic number, because the mean of its divisors is an integer number (520266228).

Almost surely, 2^3121401021 is an apocalyptic number.

It is an amenable number.

3121401021 is a deficient number, since it is larger than the sum of its proper divisors (1040728803).

3121401021 is a wasteful number, since it uses less digits than its factorization.

3121401021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65451.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 3121401021 is about 55869.4999172178. The cubic root of 3121401021 is about 1461.4474013255.

Adding to 3121401021 its reverse (1201041213), we get a palindrome (4322442234).

The spelling of 3121401021 in words is "three billion, one hundred twenty-one million, four hundred one thousand, twenty-one".