21221210001002 has 16 divisors (see below), whose sum is σ = 34726617748224. Its totient is φ = 9645726384000.

The previous prime is 21221210000971. The next prime is 21221210001007. The reversal of 21221210001002 is 20010001212212.

It is not an unprimeable number, because it can be changed into a prime (21221210001007) 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, 13126874 + ... + 14654597.

It is an arithmetic number, because the mean of its divisors is an integer number (2170413609264).

Almost surely, 2^{21221210001002} is an apocalyptic number.

21221210001002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221210001002 is a deficient number, since it is larger than the sum of its proper divisors (13505407747222).

21221210001002 is a wasteful number, since it uses less digits than its factorization.

21221210001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27816205.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221210001002 its reverse (20010001212212), we get a palindrome (41231211213214).

The spelling of 21221210001002 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten million, one thousand, two".