21101430 has 32 divisors (see below), whose sum is σ = 57878784. Its totient is φ = 4823136.

The previous prime is 21101411. The next prime is 21101441. The reversal of 21101430 is 3410112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50032 + ... + 50451.

It is an arithmetic number, because the mean of its divisors is an integer number (1808712).

Almost surely, 2^21101430 is an apocalyptic number.

21101430 is an abundant number, since it is smaller than the sum of its proper divisors (36777354).

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

21101430 is a wasteful number, since it uses less digits than its factorization.

21101430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100500.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21101430 is about 4593.6292841282. The cubic root of 21101430 is about 276.3358912026.

Adding to 21101430 its reverse (3410112), we get a palindrome (24511542).

The spelling of 21101430 in words is "twenty-one million, one hundred one thousand, four hundred thirty".