763220421 has 16 divisors (see below), whose sum is σ = 1141678720. Its totient is φ = 503871840.

The previous prime is 763220417. The next prime is 763220473. The reversal of 763220421 is 124022367.

763220421 is a `hidden beast` number, since 7 + 632 + 2 + 0 + 4 + 21 = 666.

It is not a de Polignac number, because 763220421 - 2² = 763220417 is a prime.

It is a super-3 number, since 3×763220421³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (763221421) 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, 134440 + ... + 140001.

It is an arithmetic number, because the mean of its divisors is an integer number (71354920).

Almost surely, 2^763220421 is an apocalyptic number.

It is an amenable number.

763220421 is a deficient number, since it is larger than the sum of its proper divisors (378458299).

763220421 is a wasteful number, since it uses less digits than its factorization.

763220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274553 (or 274547 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 763220421 is about 27626.4442337410. Note that the first 3 decimals coincide. The cubic root of 763220421 is about 913.8676990743.

Adding to 763220421 its reverse (124022367), we get a palindrome (887242788).

The spelling of 763220421 in words is "seven hundred sixty-three million, two hundred twenty thousand, four hundred twenty-one".