20100201212221 has 32 divisors (see below), whose sum is σ = 23545006284800. Its totient is φ = 16992890389440.

The previous prime is 20100201212219. The next prime is 20100201212293. The reversal of 20100201212221 is 12221210200102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20100201212221 - 2¹ = 20100201212219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20100201212195 and 20100201212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100201212521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6046990 + ... + 8761648.

It is an arithmetic number, because the mean of its divisors is an integer number (735781446400).

Almost surely, 2^{20100201212221} is an apocalyptic number.

It is an amenable number.

20100201212221 is a deficient number, since it is larger than the sum of its proper divisors (3444805072579).

20100201212221 is a wasteful number, since it uses less digits than its factorization.

20100201212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715689.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20100201212221 its reverse (12221210200102), we get a palindrome (32321411412323).

The spelling of 20100201212221 in words is "twenty trillion, one hundred billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".