21001010022021 has 16 divisors (see below), whose sum is σ = 28370933960960. Its totient is φ = 13816068963840.

The previous prime is 21001010021969. The next prime is 21001010022037. The reversal of 21001010022021 is 12022001010012.

It is not a de Polignac number, because 21001010022021 - 2¹⁴ = 21001010005637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001010021988 and 21001010022006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001010020021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23211160 + ... + 24098961.

It is an arithmetic number, because the mean of its divisors is an integer number (1773183372560).

Almost surely, 2^{21001010022021} is an apocalyptic number.

It is an amenable number.

21001010022021 is a deficient number, since it is larger than the sum of its proper divisors (7369923938939).

21001010022021 is a wasteful number, since it uses less digits than its factorization.

21001010022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47312076.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21001010022021 its reverse (12022001010012), we get a palindrome (33023011032033).

The spelling of 21001010022021 in words is "twenty-one trillion, one billion, ten million, twenty-two thousand, twenty-one".