921041621 has 8 divisors (see below), whose sum is σ = 933471840. Its totient is φ = 908643312.

The previous prime is 921041603. The next prime is 921041633. The reversal of 921041621 is 126140129.

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 921041621 - 2¹⁸ = 920779477 is a prime.

It is a super-3 number, since 3×921041621³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041621) 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, 53270 + ... + 68408.

It is an arithmetic number, because the mean of its divisors is an integer number (116683980).

Almost surely, 2^921041621 is an apocalyptic number.

It is an amenable number.

921041621 is a deficient number, since it is larger than the sum of its proper divisors (12430219).

921041621 is a wasteful number, since it uses less digits than its factorization.

921041621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15955.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 921041621 is about 30348.6675325293. The cubic root of 921041621 is about 972.9557417460.

The spelling of 921041621 in words is "nine hundred twenty-one million, forty-one thousand, six hundred twenty-one".