21420152011 has 8 divisors (see below), whose sum is σ = 22367360160. Its totient is φ = 20474268672.

The previous prime is 21420152003. The next prime is 21420152051. The reversal of 21420152011 is 11025102412.

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 21420152011 - 2³ = 21420152003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21420152011.

It is not an unprimeable number, because it can be changed into a prime (21420152051) 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, 298080 + ... + 362893.

It is an arithmetic number, because the mean of its divisors is an integer number (2795920020).

Almost surely, 2^21420152011 is an apocalyptic number.

21420152011 is a deficient number, since it is larger than the sum of its proper divisors (947208149).

21420152011 is a wasteful number, since it uses less digits than its factorization.

21420152011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662405.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21420152011 its reverse (11025102412), we get a palindrome (32445254423).

The spelling of 21420152011 in words is "twenty-one billion, four hundred twenty million, one hundred fifty-two thousand, eleven".