21111101022021 has 8 divisors (see below), whose sum is σ = 28194507243264. Its totient is φ = 14050881074400.

The previous prime is 21111101021999. The next prime is 21111101022031. The reversal of 21111101022021 is 12022010111112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21111101022021 - 2¹¹ = 21111101019973 is a prime.

It is a super-2 number, since 2×21111101022021² (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 (21111101022031) 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, 5796566280 + ... + 5796569921.

It is an arithmetic number, because the mean of its divisors is an integer number (3524313405408).

Almost surely, 2^{21111101022021} is an apocalyptic number.

It is an amenable number.

21111101022021 is a deficient number, since it is larger than the sum of its proper divisors (7083406221243).

21111101022021 is a wasteful number, since it uses less digits than its factorization.

21111101022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11593136811.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111101022021 its reverse (12022010111112), we get a palindrome (33133111133133).

The spelling of 21111101022021 in words is "twenty-one trillion, one hundred eleven billion, one hundred one million, twenty-two thousand, twenty-one".