20021130001221 has 16 divisors (see below), whose sum is σ = 27530734116864. Its totient is φ = 12934361213424.

The previous prime is 20021130001217. The next prime is 20021130001267. The reversal of 20021130001221 is 12210003112002.

It is not a de Polignac number, because 20021130001221 - 2² = 20021130001217 is a prime.

It is a super-2 number, since 2×20021130001221² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021130001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021130001021) 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, 611017311 + ... + 611050076.

It is an arithmetic number, because the mean of its divisors is an integer number (1720670882304).

Almost surely, 2^{20021130001221} is an apocalyptic number.

It is an amenable number.

20021130001221 is a deficient number, since it is larger than the sum of its proper divisors (7509604115643).

20021130001221 is a wasteful number, since it uses less digits than its factorization.

20021130001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222067560.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20021130001221 its reverse (12210003112002), we get a palindrome (32231133113223).

The spelling of 20021130001221 in words is "twenty trillion, twenty-one billion, one hundred thirty million, one thousand, two hundred twenty-one".