21404402011 has 12 divisors (see below), whose sum is σ = 22365736200. Its totient is φ = 20481114720.

The previous prime is 21404402003. The next prime is 21404402053. The reversal of 21404402011 is 11020440412.

It is not a de Polignac number, because 21404402011 - 2³ = 21404402003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21404402011.

It is not an unprimeable number, because it can be changed into a prime (21404402081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39601 + ... + 210658.

It is an arithmetic number, because the mean of its divisors is an integer number (1863811350).

Almost surely, 2^21404402011 is an apocalyptic number.

21404402011 is a deficient number, since it is larger than the sum of its proper divisors (961334189).

21404402011 is an equidigital number, since it uses as much as digits as its factorization.

21404402011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250410 (or 250379 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21404402011 its reverse (11020440412), we get a palindrome (32424842423).

The spelling of 21404402011 in words is "twenty-one billion, four hundred four million, four hundred two thousand, eleven".