21220111010021 has 8 divisors (see below), whose sum is σ = 26456242298304. Its totient is φ = 16535151436320.

The previous prime is 21220111009927. The next prime is 21220111010069. The reversal of 21220111010021 is 12001011102212.

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

It is not a de Polignac number, because 21220111010021 - 2¹⁰ = 21220111008997 is a prime.

It is a super-2 number, since 2×21220111010021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220111009978 and 21220111010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220111010821) 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, 137792928560 + ... + 137792928713.

It is an arithmetic number, because the mean of its divisors is an integer number (3307030287288).

Almost surely, 2^{21220111010021} is an apocalyptic number.

It is an amenable number.

21220111010021 is a deficient number, since it is larger than the sum of its proper divisors (5236131288283).

21220111010021 is a wasteful number, since it uses less digits than its factorization.

21220111010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275585857291.

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

Adding to 21220111010021 its reverse (12001011102212), we get a palindrome (33221122112233).

The spelling of 21220111010021 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, ten thousand, twenty-one".