21002022012021 has 16 divisors (see below), whose sum is σ = 29590080552960. Its totient is φ = 13223067240240.

The previous prime is 21002022012011. The next prime is 21002022012031. The reversal of 21002022012021 is 12021022020012.

It is an interprime number because it is at equal distance from previous prime (21002022012011) and next prime (21002022012031).

It is not a de Polignac number, because 21002022012021 - 2¹⁴ = 21002021995637 is a prime.

It is a super-2 number, since 2×21002022012021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002022012011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1926432085 + ... + 1926442986.

It is an arithmetic number, because the mean of its divisors is an integer number (1849380034560).

Almost surely, 2^{21002022012021} is an apocalyptic number.

It is an amenable number.

21002022012021 is a deficient number, since it is larger than the sum of its proper divisors (8588058540939).

21002022012021 is a wasteful number, since it uses less digits than its factorization.

21002022012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852875176.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002022012021 its reverse (12021022020012), we get a palindrome (33023044032033).

The spelling of 21002022012021 in words is "twenty-one trillion, two billion, twenty-two million, twelve thousand, twenty-one".