741021521 has 4 divisors (see below), whose sum is σ = 773239872. Its totient is φ = 708803172.

The previous prime is 741021511. The next prime is 741021539. The reversal of 741021521 is 125120147.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125120147 = 971 ⋅128857.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-741021521 is a prime.

It is a super-2 number, since 2×741021521² = 1098225789170306882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 32218327 = 741021521 / (7 + 4 + 1 + 0 + 2 + 1 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (741021511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16109141 + ... + 16109186.

It is an arithmetic number, because the mean of its divisors is an integer number (193309968).

Almost surely, 2^741021521 is an apocalyptic number.

It is an amenable number.

741021521 is a deficient number, since it is larger than the sum of its proper divisors (32218351).

741021521 is a wasteful number, since it uses less digits than its factorization.

741021521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32218350.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 741021521 is about 27221.7104716070. The cubic root of 741021521 is about 904.9201809888.

Adding to 741021521 its reverse (125120147), we get a palindrome (866141668).

The spelling of 741021521 in words is "seven hundred forty-one million, twenty-one thousand, five hundred twenty-one".