21203230151730 has 64 divisors (see below), whose sum is σ = 58435696512000. Its totient is φ = 4869641373120.

The previous prime is 21203230151683. The next prime is 21203230151737. The reversal of 21203230151730 is 3715103230212.

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 (21203230151737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1690841430 + ... + 1690853969.

It is an arithmetic number, because the mean of its divisors is an integer number (913057758000).

Almost surely, 2^{21203230151730} is an apocalyptic number.

21203230151730 is an abundant number, since it is smaller than the sum of its proper divisors (37232466360270).

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

21203230151730 is a wasteful number, since it uses less digits than its factorization.

21203230151730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381695439.

The product of its (nonzero) digits is 7560, while the sum is 30.

Adding to 21203230151730 its reverse (3715103230212), we get a palindrome (24918333381942).

The spelling of 21203230151730 in words is "twenty-one trillion, two hundred three billion, two hundred thirty million, one hundred fifty-one thousand, seven hundred thirty".