21420602412 has 72 divisors (see below), whose sum is σ = 58169967408. Its totient is φ = 6109255680.

The previous prime is 21420602407. The next prime is 21420602449.

It is a happy number.

21420602412 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 409213 + ... + 458580.

It is an arithmetic number, because the mean of its divisors is an integer number (807916214).

Almost surely, 2^21420602412 is an apocalyptic number.

21420602412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21420602412 is an abundant number, since it is smaller than the sum of its proper divisors (36749364996).

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

21420602412 is a wasteful number, since it uses less digits than its factorization.

21420602412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867839 (or 867826 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The spelling of 21420602412 in words is "twenty-one billion, four hundred twenty million, six hundred two thousand, four hundred twelve".