21010021210321 has 8 divisors (see below), whose sum is σ = 24683101841664. Its totient is φ = 17630787029520.

The previous prime is 21010021210291. The next prime is 21010021210333. The reversal of 21010021210321 is 12301212001012.

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 21010021210321 - 2⁷ = 21010021210193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010021210295 and 21010021210304.

It is not an unprimeable number, because it can be changed into a prime (21010021210351) 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, 73461612481 + ... + 73461612766.

It is an arithmetic number, because the mean of its divisors is an integer number (3085387730208).

Almost surely, 2^{21010021210321} is an apocalyptic number.

It is an amenable number.

21010021210321 is a deficient number, since it is larger than the sum of its proper divisors (3673080631343).

21010021210321 is a wasteful number, since it uses less digits than its factorization.

21010021210321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146923225271.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21010021210321 its reverse (12301212001012), we get a palindrome (33311233211333).

The spelling of 21010021210321 in words is "twenty-one trillion, ten billion, twenty-one million, two hundred ten thousand, three hundred twenty-one".