21260290463 has 4 divisors (see below), whose sum is σ = 21261442680. Its totient is φ = 21259138248.

The previous prime is 21260290439. The next prime is 21260290487. The reversal of 21260290463 is 36409206212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21260290439) and next prime (21260290487).

It is a cyclic number.

It is not a de Polignac number, because 21260290463 - 2²² = 21256096159 is a prime.

It is a super-2 number, since 2×21260290463² (a number of 21 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 (21260290963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547973 + ... + 585486.

It is an arithmetic number, because the mean of its divisors is an integer number (5315360670).

Almost surely, 2^21260290463 is an apocalyptic number.

21260290463 is a deficient number, since it is larger than the sum of its proper divisors (1152217).

21260290463 is a wasteful number, since it uses less digits than its factorization.

21260290463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152216.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 21260290463 its reverse (36409206212), we get a palindrome (57669496675).

The spelling of 21260290463 in words is "twenty-one billion, two hundred sixty million, two hundred ninety thousand, four hundred sixty-three".