21404032002021 has 32 divisors (see below), whose sum is σ = 28803407431680. Its totient is φ = 14137571758464.

The previous prime is 21404032002013. The next prime is 21404032002029. The reversal of 21404032002021 is 12020023040412.

It is an interprime number because it is at equal distance from previous prime (21404032002013) and next prime (21404032002029).

It is not a de Polignac number, because 21404032002021 - 2³ = 21404032002013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404032002029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 855020121 + ... + 855045153.

It is an arithmetic number, because the mean of its divisors is an integer number (900106482240).

Almost surely, 2^{21404032002021} is an apocalyptic number.

It is an amenable number.

21404032002021 is a deficient number, since it is larger than the sum of its proper divisors (7399375429659).

21404032002021 is a wasteful number, since it uses less digits than its factorization.

21404032002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30585.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21404032002021 its reverse (12020023040412), we get a palindrome (33424055042433).

The spelling of 21404032002021 in words is "twenty-one trillion, four hundred four billion, thirty-two million, two thousand, twenty-one".