21261361022102 has 16 divisors (see below), whose sum is σ = 32511071593440. Its totient is φ = 10424550656832.

The previous prime is 21261361022093. The next prime is 21261361022137. The reversal of 21261361022102 is 20122016316212.

It is a super-3 number, since 3×21261361022102³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53174663 + ... + 53573010.

It is an arithmetic number, because the mean of its divisors is an integer number (2031941974590).

Almost surely, 2^{21261361022102} is an apocalyptic number.

21261361022102 is a deficient number, since it is larger than the sum of its proper divisors (11249710571338).

21261361022102 is a wasteful number, since it uses less digits than its factorization.

21261361022102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106749607.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 21261361022102 its reverse (20122016316212), we get a palindrome (41383377338314).

The spelling of 21261361022102 in words is "twenty-one trillion, two hundred sixty-one billion, three hundred sixty-one million, twenty-two thousand, one hundred two".