7641229021 has 4 divisors (see below), whose sum is σ = 7645019452. Its totient is φ = 7637438592.

The previous prime is 7641229019. The next prime is 7641229039. The reversal of 7641229021 is 1209221467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1209221467 = 7549 ⋅160183.

It can be written as a sum of positive squares in 2 ways, for example, as 4097408121 + 3543820900 = 64011^2 + 59530^2 .

It is a cyclic number.

It is not a de Polignac number, because 7641229021 - 2¹ = 7641229019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7641229061) 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, 1892190 + ... + 1896223.

It is an arithmetic number, because the mean of its divisors is an integer number (1911254863).

Almost surely, 2^7641229021 is an apocalyptic number.

It is an amenable number.

7641229021 is a deficient number, since it is larger than the sum of its proper divisors (3790431).

7641229021 is a wasteful number, since it uses less digits than its factorization.

7641229021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790430.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 7641229021 is about 87414.1236929136. The cubic root of 7641229021 is about 1969.6440062925.

The spelling of 7641229021 in words is "seven billion, six hundred forty-one million, two hundred twenty-nine thousand, twenty-one".