20101221020002 has 16 divisors (see below), whose sum is σ = 30299471177472. Its totient is φ = 10001434287600.

The previous prime is 20101221019981. The next prime is 20101221020009. The reversal of 20101221020002 is 20002012210102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20101221020009) 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, 8160124 + ... + 10333927.

It is an arithmetic number, because the mean of its divisors is an integer number (1893716948592).

Almost surely, 2^{20101221020002} is an apocalyptic number.

20101221020002 is a deficient number, since it is larger than the sum of its proper divisors (10198250157470).

20101221020002 is a wasteful number, since it uses less digits than its factorization.

20101221020002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18496713.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20101221020002 its reverse (20002012210102), we get a palindrome (40103233230104).

The spelling of 20101221020002 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, twenty thousand, two".