76220421 has 16 divisors (see below), whose sum is σ = 103274880. Its totient is φ = 49996800.

The previous prime is 76220411. The next prime is 76220423. The reversal of 76220421 is 12402267.

It is not a de Polignac number, because 76220421 - 2¹⁰ = 76219397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 76220391 and 76220400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76220423) 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, 50445 + ... + 51933.

It is an arithmetic number, because the mean of its divisors is an integer number (6454680).

Almost surely, 2^76220421 is an apocalyptic number.

It is an amenable number.

76220421 is a deficient number, since it is larger than the sum of its proper divisors (27054459).

76220421 is a wasteful number, since it uses less digits than its factorization.

76220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 76220421 is about 8730.4307453871. The cubic root of 76220421 is about 423.9914651332.

Adding to 76220421 its reverse (12402267), we get a palindrome (88622688).

The spelling of 76220421 in words is "seventy-six million, two hundred twenty thousand, four hundred twenty-one".