21041221102 has 8 divisors (see below), whose sum is σ = 34431089112. Its totient is φ = 9564191400.

The previous prime is 21041221009. The next prime is 21041221127. The reversal of 21041221102 is 20112214012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478209549 + ... + 478209592.

It is an arithmetic number, because the mean of its divisors is an integer number (4303886139).

Almost surely, 2^21041221102 is an apocalyptic number.

21041221102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21041221102 is a deficient number, since it is larger than the sum of its proper divisors (13389868010).

21041221102 is a wasteful number, since it uses less digits than its factorization.

21041221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956419154.

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

Adding to 21041221102 its reverse (20112214012), we get a palindrome (41153435114).

The spelling of 21041221102 in words is "twenty-one billion, forty-one million, two hundred twenty-one thousand, one hundred two".