21001220110212 has 48 divisors (see below), whose sum is σ = 51889364759232. Its totient is φ = 6588110464000.

The previous prime is 21001220110201. The next prime is 21001220110231. The reversal of 21001220110212 is 21201102210012.

It is a super-2 number, since 2×21001220110212² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001220110191 and 21001220110200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1306998 + ... + 6611405.

It is an arithmetic number, because the mean of its divisors is an integer number (1081028432484).

Almost surely, 2^{21001220110212} is an apocalyptic number.

It is an amenable number.

21001220110212 is an abundant number, since it is smaller than the sum of its proper divisors (30888144649020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001220110212 is a wasteful number, since it uses less digits than its factorization.

21001220110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7931428 (or 7931426 counting only the distinct ones).

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

Adding to 21001220110212 its reverse (21201102210012), we get a palindrome (42202322320224).

The spelling of 21001220110212 in words is "twenty-one trillion, one billion, two hundred twenty million, one hundred ten thousand, two hundred twelve".