20211221121002 has 16 divisors (see below), whose sum is σ = 30872100758400. Its totient is φ = 9921950132640.

The previous prime is 20211221120999. The next prime is 20211221121041. The reversal of 20211221121002 is 20012112211202.

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, 357287699 + ... + 357344262.

It is an arithmetic number, because the mean of its divisors is an integer number (1929506297400).

Almost surely, 2^{20211221121002} is an apocalyptic number.

20211221121002 is a deficient number, since it is larger than the sum of its proper divisors (10660879637398).

20211221121002 is a wasteful number, since it uses less digits than its factorization.

20211221121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714632221.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20211221121002 its reverse (20012112211202), we get a palindrome (40223333332204).

The spelling of 20211221121002 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two".