21240102 has 32 divisors (see below), whose sum is σ = 45948672. Its totient is φ = 6506784.

The previous prime is 21240101. The next prime is 21240133. The reversal of 21240102 is 20104212.

It is a super-2 number, since 2×21240102² = 902283865940808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23503 + ... + 24389.

It is an arithmetic number, because the mean of its divisors is an integer number (1435896).

Almost surely, 2^21240102 is an apocalyptic number.

21240102 is an abundant number, since it is smaller than the sum of its proper divisors (24708570).

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

21240102 is a wasteful number, since it uses less digits than its factorization.

21240102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21240102 is about 4608.6985147653. The cubic root of 21240102 is about 276.9399010315.

Adding to 21240102 its reverse (20104212), we get a palindrome (41344314).

The spelling of 21240102 in words is "twenty-one million, two hundred forty thousand, one hundred two".