21421102 has 8 divisors (see below), whose sum is σ = 32155200. Its totient is φ = 10702704.

The previous prime is 21421097. The next prime is 21421117. The reversal of 21421102 is 20112412.

It is a happy number.

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

It is a super-2 number, since 2×21421102² = 917727221788808, which contains 22 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474 + ... + 6562.

It is an arithmetic number, because the mean of its divisors is an integer number (4019400).

Almost surely, 2^21421102 is an apocalyptic number.

21421102 is a deficient number, since it is larger than the sum of its proper divisors (10734098).

21421102 is a wasteful number, since it uses less digits than its factorization.

21421102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7850.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21421102 is about 4628.2936380485. The cubic root of 21421102 is about 277.7243355440.

Adding to 21421102 its reverse (20112412), we get a palindrome (41533514).

It can be divided in two parts, 214 and 21102, that added together give a square (21316 = 146²).

The spelling of 21421102 in words is "twenty-one million, four hundred twenty-one thousand, one hundred two".