21120220110021 has 8 divisors (see below), whose sum is σ = 28691619772320. Its totient is φ = 13814483593872.

The previous prime is 21120220110019. The next prime is 21120220110023. The reversal of 21120220110021 is 12001102202112.

It is an interprime number because it is at equal distance from previous prime (21120220110019) and next prime (21120220110023).

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

It is not a de Polignac number, because 21120220110021 - 2¹ = 21120220110019 is a prime.

It is a super-2 number, since 2×21120220110021² (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 (21120220110023) 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, 66415786351 + ... + 66415786668.

It is an arithmetic number, because the mean of its divisors is an integer number (3586452471540).

Almost surely, 2^{21120220110021} is an apocalyptic number.

It is an amenable number.

21120220110021 is a deficient number, since it is larger than the sum of its proper divisors (7571399662299).

21120220110021 is a wasteful number, since it uses less digits than its factorization.

21120220110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132831573075.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120220110021 its reverse (12001102202112), we get a palindrome (33121322312133).

The spelling of 21120220110021 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, one hundred ten thousand, twenty-one".