21221020002102 has 16 divisors (see below), whose sum is σ = 42442372416240. Its totient is φ = 7073617932032.

The previous prime is 21221020002047. The next prime is 21221020002107. The reversal of 21221020002102 is 20120002012212.

It is a super-2 number, since 2×21221020002102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221020002107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13016727 + ... + 14556002.

It is an arithmetic number, because the mean of its divisors is an integer number (2652648276015).

Almost surely, 2^{21221020002102} is an apocalyptic number.

21221020002102 is an abundant number, since it is smaller than the sum of its proper divisors (21221352414138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221020002102 is a wasteful number, since it uses less digits than its factorization.

21221020002102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27701007.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21221020002102 its reverse (20120002012212), we get a palindrome (41341022014314).

The spelling of 21221020002102 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two thousand, one hundred two".