21121302201212 has 24 divisors (see below), whose sum is σ = 37516298018640. Its totient is φ = 10402379602560.

The previous prime is 21121302201193. The next prime is 21121302201217. The reversal of 21121302201212 is 21210220312112.

It is a super-2 number, since 2×21121302201212² (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 (21121302201217) 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, 1850864 + ... + 6757832.

It is an arithmetic number, because the mean of its divisors is an integer number (1563179084110).

Almost surely, 2^{21121302201212} is an apocalyptic number.

It is an amenable number.

21121302201212 is a deficient number, since it is larger than the sum of its proper divisors (16394995817428).

21121302201212 is a wasteful number, since it uses less digits than its factorization.

21121302201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923101 (or 4923099 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21121302201212 its reverse (21210220312112), we get a palindrome (42331522513324).

The spelling of 21121302201212 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred two million, two hundred one thousand, two hundred twelve".