21221201212060 has 48 divisors (see below), whose sum is σ = 45296332099200. Its totient is φ = 8349095831040.

The previous prime is 21221201212027. The next prime is 21221201212061. The reversal of 21221201212060 is 6021210212212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221201212061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48248016 + ... + 48685864.

It is an arithmetic number, because the mean of its divisors is an integer number (943673585400).

Almost surely, 2^{21221201212060} is an apocalyptic number.

21221201212060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221201212060 is an abundant number, since it is smaller than the sum of its proper divisors (24075130887140).

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

21221201212060 is a wasteful number, since it uses less digits than its factorization.

21221201212060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477646 (or 477644 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21221201212060 its reverse (6021210212212), we get a palindrome (27242411424272).

The spelling of 21221201212060 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, sixty".