21421411 has 8 divisors (see below), whose sum is σ = 24743664. Its totient is φ = 18328320.

The previous prime is 21421399. The next prime is 21421427. The reversal of 21421411 is 11412412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21421411 - 2²¹ = 19324259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21421451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57090 + ... + 57463.

It is an arithmetic number, because the mean of its divisors is an integer number (3092958).

Almost surely, 2^21421411 is an apocalyptic number.

21421411 is a deficient number, since it is larger than the sum of its proper divisors (3322253).

21421411 is a wasteful number, since it uses less digits than its factorization.

21421411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114581.

The product of its digits is 64, while the sum is 16.

The square root of 21421411 is about 4628.3270195612. The cubic root of 21421411 is about 277.7256709314.

Adding to 21421411 its reverse (11412412), we get a palindrome (32833823).

It can be divided in two parts, 2142 and 1411, that added together give a palindrome (3553).

The spelling of 21421411 in words is "twenty-one million, four hundred twenty-one thousand, four hundred eleven".