21121102 has 4 divisors (see below), whose sum is σ = 31681656. Its totient is φ = 10560550.

The previous prime is 21121099. The next prime is 21121129. The reversal of 21121102 is 20112112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21121102² = 892201899388808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280274 + ... + 5280277.

It is an arithmetic number, because the mean of its divisors is an integer number (7920414).

Almost surely, 2^21121102 is an apocalyptic number.

21121102 is a deficient number, since it is larger than the sum of its proper divisors (10560554).

21121102 is a wasteful number, since it uses less digits than its factorization.

21121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560553.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21121102 is about 4595.7700116520. The cubic root of 21121102 is about 276.4217367471.

Adding to 21121102 its reverse (20112112), we get a palindrome (41233214).

It can be divided in two parts, 2112110 and 2, that added together give a palindrome (2112112).

The spelling of 21121102 in words is "twenty-one million, one hundred twenty-one thousand, one hundred two".