2101221011231 has 16 divisors (see below), whose sum is σ = 2177939327040. Its totient is φ = 2024790324480.

The previous prime is 2101221011213. The next prime is 2101221011261. The reversal of 2101221011231 is 1321101221012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2101221011231 - 2¹⁸ = 2101220749087 is a prime.

It is a super-2 number, since 2×2101221011231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101221011261) 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, 35248691 + ... + 35308251.

It is an arithmetic number, because the mean of its divisors is an integer number (136121207940).

Almost surely, 2^{2101221011231} is an apocalyptic number.

2101221011231 is a deficient number, since it is larger than the sum of its proper divisors (76718315809).

2101221011231 is a wasteful number, since it uses less digits than its factorization.

2101221011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61954.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2101221011231 its reverse (1321101221012), we get a palindrome (3422322232243).

The spelling of 2101221011231 in words is "two trillion, one hundred one billion, two hundred twenty-one million, eleven thousand, two hundred thirty-one".