21100001121231 has 16 divisors (see below), whose sum is σ = 31083377612544. Its totient is φ = 12663598285184.

The previous prime is 21100001121203. The next prime is 21100001121263. The reversal of 21100001121231 is 13212110000112.

It is a cyclic number.

It is not a de Polignac number, because 21100001121231 - 2¹⁸ = 21100000859087 is a prime.

It is a super-2 number, since 2×21100001121231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21100001121231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100001121131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8994031701 + ... + 8994034046.

It is an arithmetic number, because the mean of its divisors is an integer number (1942711100784).

Almost surely, 2^{21100001121231} is an apocalyptic number.

21100001121231 is a deficient number, since it is larger than the sum of its proper divisors (9983376491313).

21100001121231 is a wasteful number, since it uses less digits than its factorization.

21100001121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17988065790.

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

Adding to 21100001121231 its reverse (13212110000112), we get a palindrome (34312111121343).

The spelling of 21100001121231 in words is "twenty-one trillion, one hundred billion, one million, one hundred twenty-one thousand, two hundred thirty-one".