21001112121003 has 64 divisors (see below), whose sum is σ = 32836073905152. Its totient is φ = 11691801722880.

The previous prime is 21001112120951. The next prime is 21001112121023. The reversal of 21001112121003 is 30012121110012.

It is not a de Polignac number, because 21001112121003 - 2²² = 21001107926699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001112121023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1432831051 + ... + 1432845707.

It is an arithmetic number, because the mean of its divisors is an integer number (513063654768).

Almost surely, 2^{21001112121003} is an apocalyptic number.

21001112121003 is a deficient number, since it is larger than the sum of its proper divisors (11834961784149).

21001112121003 is a wasteful number, since it uses less digits than its factorization.

21001112121003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26084.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21001112121003 its reverse (30012121110012), we get a palindrome (51013233231015).

The spelling of 21001112121003 in words is "twenty-one trillion, one billion, one hundred twelve million, one hundred twenty-one thousand, three".