20211221110202 has 4 divisors (see below), whose sum is σ = 30316831665306. Its totient is φ = 10105610555100.

The previous prime is 20211221110193. The next prime is 20211221110211. The reversal of 20211221110202 is 20201112211202.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20211221110193) and next prime (20211221110211).

It can be written as a sum of positive squares in only one way, i.e., 13390030059121 + 6821191051081 = 3659239^2 + 2611741^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052805277549 + ... + 5052805277552.

Almost surely, 2^{20211221110202} is an apocalyptic number.

20211221110202 is a deficient number, since it is larger than the sum of its proper divisors (10105610555104).

20211221110202 is a wasteful number, since it uses less digits than its factorization.

20211221110202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10105610555103.

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

Adding to 20211221110202 its reverse (20201112211202), we get a palindrome (40412333321404).

The spelling of 20211221110202 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, one hundred ten thousand, two hundred two".