76421721811 has 16 divisors (see below), whose sum is σ = 80614010880. Its totient is φ = 72303343200.

The previous prime is 76421721781. The next prime is 76421721821. The reversal of 76421721811 is 11812712467.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76421721811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76421721821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2397766 + ... + 2429428.

It is an arithmetic number, because the mean of its divisors is an integer number (5038375680).

Almost surely, 2^76421721811 is an apocalyptic number.

76421721811 is a deficient number, since it is larger than the sum of its proper divisors (4192289069).

76421721811 is a wasteful number, since it uses less digits than its factorization.

76421721811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32826.

The product of its digits is 37632, while the sum is 40.

The spelling of 76421721811 in words is "seventy-six billion, four hundred twenty-one million, seven hundred twenty-one thousand, eight hundred eleven".