21030029120 has 56 divisors (see below), whose sum is σ = 50564027904. Its totient is φ = 8330328576.

The previous prime is 21030029081. The next prime is 21030029173. The reversal of 21030029120 is 2192003012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21030029092 and 21030029101.

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, 286064 + ... + 351983.

Almost surely, 2^21030029120 is an apocalyptic number.

21030029120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030029120 is an abundant number, since it is smaller than the sum of its proper divisors (29533998784).

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

21030029120 is a wasteful number, since it uses less digits than its factorization.

21030029120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638167 (or 638157 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 21030029120 in words is "twenty-one billion, thirty million, twenty-nine thousand, one hundred twenty".