263412506421 has 6 divisors (see below), whose sum is σ = 380484731510. Its totient is φ = 175608337608.

The previous prime is 263412506419. The next prime is 263412506431. The reversal of 263412506421 is 124605214362.

263412506421 is a `hidden beast` number, since 2 + 6 + 3 + 4 + 1 + 2 + 5 + 0 + 642 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 262446167025 + 966339396 = 512295^2 + 31086^2 .

It is not a de Polignac number, because 263412506421 - 2¹ = 263412506419 is a prime.

It is a super-2 number, since 2×263412506421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263412506431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14634028126 + ... + 14634028143.

Almost surely, 2^263412506421 is an apocalyptic number.

It is an amenable number.

263412506421 is a deficient number, since it is larger than the sum of its proper divisors (117072225089).

263412506421 is a wasteful number, since it uses less digits than its factorization.

263412506421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29268056275 (or 29268056272 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 263412506421 in words is "two hundred sixty-three billion, four hundred twelve million, five hundred six thousand, four hundred twenty-one".