21203231010 has 64 divisors (see below), whose sum is σ = 54822458880. Its totient is φ = 5217327360.

The previous prime is 21203231009. The next prime is 21203231029. The reversal of 21203231010 is 1013230212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1247751 + ... + 1264629.

It is an arithmetic number, because the mean of its divisors is an integer number (856600920).

Almost surely, 2^21203231010 is an apocalyptic number.

21203231010 is an abundant number, since it is smaller than the sum of its proper divisors (33619227870).

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

21203231010 is a wasteful number, since it uses less digits than its factorization.

21203231010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20123.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21203231010 its reverse (1013230212), we get a palindrome (22216461222).

The spelling of 21203231010 in words is "twenty-one billion, two hundred three million, two hundred thirty-one thousand, ten".