21000021201222 has 16 divisors (see below), whose sum is σ = 48000048460032. Its totient is φ = 6000006057480.

The previous prime is 21000021201199. The next prime is 21000021201241. The reversal of 21000021201222 is 22210212000012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250000252354 + ... + 250000252437.

It is an arithmetic number, because the mean of its divisors is an integer number (3000003028752).

Almost surely, 2^{21000021201222} is an apocalyptic number.

21000021201222 is an abundant number, since it is smaller than the sum of its proper divisors (27000027258810).

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

21000021201222 is a wasteful number, since it uses less digits than its factorization.

21000021201222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500000504803.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21000021201222 its reverse (22210212000012), we get a palindrome (43210233201234).

The spelling of 21000021201222 in words is "twenty-one trillion, twenty-one million, two hundred one thousand, two hundred twenty-two".