21400021030 has 16 divisors (see below), whose sum is σ = 38562523920. Its totient is φ = 8550567072.

The previous prime is 21400021003. The next prime is 21400021061. The reversal of 21400021030 is 3012000412.

It is a self number, because there is not a number n which added to its sum of digits gives 21400021030.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1170645 + ... + 1188784.

It is an arithmetic number, because the mean of its divisors is an integer number (2410157745).

Almost surely, 2^21400021030 is an apocalyptic number.

21400021030 is a deficient number, since it is larger than the sum of its proper divisors (17162502890).

21400021030 is a wasteful number, since it uses less digits than its factorization.

21400021030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360343.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21400021030 its reverse (3012000412), we get a palindrome (24412021442).

The spelling of 21400021030 in words is "twenty-one billion, four hundred million, twenty-one thousand, thirty".