21001001112010 has 64 divisors (see below), whose sum is σ = 40488823296000. Its totient is φ = 7825153644352.

The previous prime is 21001001111957. The next prime is 21001001112011. The reversal of 21001001112010 is 1021110010012.

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

It is not an unprimeable number, because it can be changed into a prime (21001001112011) 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, 5779810 + ... + 8683789.

It is an arithmetic number, because the mean of its divisors is an integer number (632637864000).

Almost surely, 2^{21001001112010} is an apocalyptic number.

21001001112010 is a deficient number, since it is larger than the sum of its proper divisors (19487822183990).

21001001112010 is a wasteful number, since it uses less digits than its factorization.

21001001112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14463795.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001001112010 its reverse (1021110010012), we get a palindrome (22022111122022).

The spelling of 21001001112010 in words is "twenty-one trillion, one billion, one million, one hundred twelve thousand, ten".