761244021 has 8 divisors (see below), whose sum is σ = 1127768960. Its totient is φ = 507495996.

The previous prime is 761243993. The next prime is 761244097. The reversal of 761244021 is 120442167.

761244021 is a `hidden beast` number, since 7 + 612 + 4 + 40 + 2 + 1 = 666.

It is not a de Polignac number, because 761244021 - 2¹⁴ = 761227637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 28194223 = 761244021 / (7 + 6 + 1 + 2 + 4 + 4 + 0 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (761244221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14097085 + ... + 14097138.

It is an arithmetic number, because the mean of its divisors is an integer number (140971120).

Almost surely, 2^761244021 is an apocalyptic number.

It is an amenable number.

761244021 is a deficient number, since it is larger than the sum of its proper divisors (366524939).

761244021 is a wasteful number, since it uses less digits than its factorization.

761244021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28194232 (or 28194226 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 761244021 is about 27590.6509709358. The cubic root of 761244021 is about 913.0781807937.

Adding to 761244021 its reverse (120442167), we get a palindrome (881686188).

The spelling of 761244021 in words is "seven hundred sixty-one million, two hundred forty-four thousand, twenty-one".