21054102 has 8 divisors (see below), whose sum is σ = 42108216. Its totient is φ = 7018032.

The previous prime is 21054067. The next prime is 21054119. The reversal of 21054102 is 20145012.

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

21054102 is an admirable number.

It is a super-2 number, since 2×21054102² = 886550422052808, 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 in 3 ways as a sum of consecutive naturals, for example, 1754503 + ... + 1754514.

It is an arithmetic number, because the mean of its divisors is an integer number (5263527).

Almost surely, 2^21054102 is an apocalyptic number.

21054102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21054102 is a wasteful number, since it uses less digits than its factorization.

21054102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509022.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21054102 is about 4588.4749100327. The cubic root of 21054102 is about 276.1291403640.

Adding to 21054102 its reverse (20145012), we get a palindrome (41199114).

The spelling of 21054102 in words is "twenty-one million, fifty-four thousand, one hundred two".