20100221002 has 4 divisors (see below), whose sum is σ = 30150331506. Its totient is φ = 10050110500.

The previous prime is 20100220979. The next prime is 20100221003. The reversal of 20100221002 is 20012200102.

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

It can be written as a sum of positive squares in only one way, i.e., 14570662681 + 5529558321 = 120709^2 + 74361^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20100221002.

It is not an unprimeable number, because it can be changed into a prime (20100221003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025055249 + ... + 5025055252.

Almost surely, 2^20100221002 is an apocalyptic number.

20100221002 is a deficient number, since it is larger than the sum of its proper divisors (10050110504).

20100221002 is a wasteful number, since it uses less digits than its factorization.

20100221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10050110503.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20100221002 its reverse (20012200102), we get a palindrome (40112421104).

The spelling of 20100221002 in words is "twenty billion, one hundred million, two hundred twenty-one thousand, two".