921741021 has 12 divisors (see below), whose sum is σ = 1341568800. Its totient is φ = 609802440.

The previous prime is 921741001. The next prime is 921741061. The reversal of 921741021 is 120147129.

It is not a de Polignac number, because 921741021 - 2²² = 917546717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921741001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 389721 + ... + 392078.

It is an arithmetic number, because the mean of its divisors is an integer number (111797400).

Almost surely, 2^921741021 is an apocalyptic number.

It is an amenable number.

921741021 is a deficient number, since it is larger than the sum of its proper divisors (419827779).

921741021 is a wasteful number, since it uses less digits than its factorization.

921741021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781936 (or 781933 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 921741021 is about 30360.1880923027. The cubic root of 921741021 is about 973.2019532306.

The spelling of 921741021 in words is "nine hundred twenty-one million, seven hundred forty-one thousand, twenty-one".