21111010022021 has 16 divisors (see below), whose sum is σ = 22406388738048. Its totient is φ = 19855283500800.

The previous prime is 21111010022017. The next prime is 21111010022059. The reversal of 21111010022021 is 12022001011112.

It is a cyclic number.

It is not a de Polignac number, because 21111010022021 - 2² = 21111010022017 is a prime.

It is a super-2 number, since 2×21111010022021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111010021987 and 21111010022005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111010022321) 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, 9435245 + ... + 11456258.

It is an arithmetic number, because the mean of its divisors is an integer number (1400399296128).

Almost surely, 2^{21111010022021} is an apocalyptic number.

It is an amenable number.

21111010022021 is a deficient number, since it is larger than the sum of its proper divisors (1295378716027).

21111010022021 is a wasteful number, since it uses less digits than its factorization.

21111010022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20892452.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111010022021 its reverse (12022001011112), we get a palindrome (33133011033133).

The spelling of 21111010022021 in words is "twenty-one trillion, one hundred eleven billion, ten million, twenty-two thousand, twenty-one".