21121120220212 has 6 divisors (see below), whose sum is σ = 36961960385378. Its totient is φ = 10560560110104.

The previous prime is 21121120220197. The next prime is 21121120220219. The reversal of 21121120220212 is 21202202112112.

It can be written as a sum of positive squares in only one way, i.e., 19911639364516 + 1209480855696 = 4462246^2 + 1099764^2 .

It is a super-2 number, since 2×21121120220212² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121120220212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121120220219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640140027523 + ... + 2640140027530.

Almost surely, 2^{21121120220212} is an apocalyptic number.

It is an amenable number.

21121120220212 is a deficient number, since it is larger than the sum of its proper divisors (15840840165166).

21121120220212 is a wasteful number, since it uses less digits than its factorization.

21121120220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280280055057 (or 5280280055055 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21121120220212 its reverse (21202202112112), we get a palindrome (42323322332324).

The spelling of 21121120220212 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, two hundred twelve".