21403627481 has 8 divisors (see below), whose sum is σ = 21437955840. Its totient is φ = 21369321792.

The previous prime is 21403627457. The next prime is 21403627489. The reversal of 21403627481 is 18472630412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21403627481 - 2¹⁰ = 21403626457 is a prime.

It is a super-2 number, since 2×21403627481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21403627489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3204161 + ... + 3210833.

It is an arithmetic number, because the mean of its divisors is an integer number (2679744480).

Almost surely, 2^21403627481 is an apocalyptic number.

It is an amenable number.

21403627481 is a deficient number, since it is larger than the sum of its proper divisors (34328359).

21403627481 is an equidigital number, since it uses as much as digits as its factorization.

21403627481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11335.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 21403627481 in words is "twenty-one billion, four hundred three million, six hundred twenty-seven thousand, four hundred eighty-one".