21030945420 has 48 divisors (see below), whose sum is σ = 58911416928. Its totient is φ = 5605893120.

The previous prime is 21030945371. The next prime is 21030945427. The reversal of 21030945420 is 2454903012.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21030945427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72510 + ... + 217530.

It is an arithmetic number, because the mean of its divisors is an integer number (1227321186).

Almost surely, 2^21030945420 is an apocalyptic number.

21030945420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is a pronic number, being equal to 145020×145021.

It is an amenable number.

21030945420 is an abundant number, since it is smaller than the sum of its proper divisors (37880471508).

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

21030945420 is a wasteful number, since it uses less digits than its factorization.

21030945420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147450 (or 147448 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 21030945420 in words is "twenty-one billion, thirty million, nine hundred forty-five thousand, four hundred twenty".