21102021221002 has 4 divisors (see below), whose sum is σ = 31653031831506. Its totient is φ = 10551010610500.

The previous prime is 21102021220999. The next prime is 21102021221041. The reversal of 21102021221002 is 20012212020112.

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., 18975006072961 + 2127015148041 = 4356031^2 + 1458429^2 .

It is a super-2 number, since 2×21102021221002² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275505305249 + ... + 5275505305252.

Almost surely, 2^{21102021221002} is an apocalyptic number.

21102021221002 is a deficient number, since it is larger than the sum of its proper divisors (10551010610504).

21102021221002 is a wasteful number, since it uses less digits than its factorization.

21102021221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10551010610503.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21102021221002 its reverse (20012212020112), we get a palindrome (41114233241114).

The spelling of 21102021221002 in words is "twenty-one trillion, one hundred two billion, twenty-one million, two hundred twenty-one thousand, two".