21022010011021 has 16 divisors (see below), whose sum is σ = 21424390141504. Its totient is φ = 20622989971584.

The previous prime is 21022010011001. The next prime is 21022010011033. The reversal of 21022010011021 is 12011001022012.

It is a cyclic number.

It is not a de Polignac number, because 21022010011021 - 2²⁷ = 21021875793293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022010010992 and 21022010011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022010011001) 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, 10370335 + ... + 12230611.

It is an arithmetic number, because the mean of its divisors is an integer number (1339024383844).

Almost surely, 2^{21022010011021} is an apocalyptic number.

It is an amenable number.

21022010011021 is a deficient number, since it is larger than the sum of its proper divisors (402380130483).

21022010011021 is a wasteful number, since it uses less digits than its factorization.

21022010011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861180.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21022010011021 its reverse (12011001022012), we get a palindrome (33033011033033).

The spelling of 21022010011021 in words is "twenty-one trillion, twenty-two billion, ten million, eleven thousand, twenty-one".