921071424 has 336 divisors, whose sum is σ = 3239828928. Its totient is φ = 228114432.

The previous prime is 921071401. The next prime is 921071443. The reversal of 921071424 is 424170129.

It is a tau number, because it is divible by the number of its divisors (336).

It is a junction number, because it is equal to n+sod(n) for n = 921071391 and 921071400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2078947 + ... + 2079389.

It is an arithmetic number, because the mean of its divisors is an integer number (9642348).

Almost surely, 2^921071424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921071424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1619914464).

921071424 is an abundant number, since it is smaller than the sum of its proper divisors (2318757504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921071424 is a wasteful number, since it uses less digits than its factorization.

921071424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 921071424 is about 30349.1585385823. The cubic root of 921071424 is about 972.9662359106.

The spelling of 921071424 in words is "nine hundred twenty-one million, seventy-one thousand, four hundred twenty-four".