21427472001 has 16 divisors (see below), whose sum is σ = 30865968896. Its totient is φ = 13144000896.

The previous prime is 21427471927. The next prime is 21427472021. The reversal of 21427472001 is 10027472412.

It is not a de Polignac number, because 21427472001 - 2⁹ = 21427471489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21427472001.

It is not an unprimeable number, because it can be changed into a prime (21427472021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 865465 + ... + 889878.

It is an arithmetic number, because the mean of its divisors is an integer number (1929123056).

Almost surely, 2^21427472001 is an apocalyptic number.

It is an amenable number.

21427472001 is a deficient number, since it is larger than the sum of its proper divisors (9438496895).

21427472001 is a wasteful number, since it uses less digits than its factorization.

21427472001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755672.

The product of its (nonzero) digits is 6272, while the sum is 30.

The spelling of 21427472001 in words is "twenty-one billion, four hundred twenty-seven million, four hundred seventy-two thousand, one".