21000112210 has 128 divisors (see below), whose sum is σ = 47930517504. Its totient is φ = 6434588160.

The previous prime is 21000112207. The next prime is 21000112247. The reversal of 21000112210 is 1221100012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30746529 + ... + 30747211.

It is an arithmetic number, because the mean of its divisors is an integer number (374457168).

Almost surely, 2^21000112210 is an apocalyptic number.

21000112210 is an abundant number, since it is smaller than the sum of its proper divisors (26930405294).

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

21000112210 is a wasteful number, since it uses less digits than its factorization.

21000112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000112210 its reverse (1221100012), we get a palindrome (22221212222).

The spelling of 21000112210 in words is "twenty-one billion, one hundred twelve thousand, two hundred ten".