21020001102202 has 4 divisors (see below), whose sum is σ = 31530001653306. Its totient is φ = 10510000551100.

The previous prime is 21020001102179. The next prime is 21020001102203. The reversal of 21020001102202 is 20220110002012.

It is a happy number.

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., 19001325620601 + 2018675481601 = 4359051^2 + 1420801^2 .

It is not an unprimeable number, because it can be changed into a prime (21020001102203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255000275549 + ... + 5255000275552.

Almost surely, 2^{21020001102202} is an apocalyptic number.

21020001102202 is a deficient number, since it is larger than the sum of its proper divisors (10510000551104).

21020001102202 is a wasteful number, since it uses less digits than its factorization.

21020001102202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510000551103.

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

Adding to 21020001102202 its reverse (20220110002012), we get a palindrome (41240111104214).

The spelling of 21020001102202 in words is "twenty-one trillion, twenty billion, one million, one hundred two thousand, two hundred two".