2121201101031 has 12 divisors (see below), whose sum is σ = 2828895102648. Its totient is φ = 1413820649904.

The previous prime is 2121201101011. The next prime is 2121201101051. The reversal of 2121201101031 is 1301011021212.

It is an interprime number because it is at equal distance from previous prime (2121201101011) and next prime (2121201101051).

It is not a de Polignac number, because 2121201101031 - 2⁹ = 2121201100519 is a prime.

It is a super-2 number, since 2×2121201101031² (a number of 25 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 2121201101031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121201101011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96878521 + ... + 96900413.

It is an arithmetic number, because the mean of its divisors is an integer number (235741258554).

Almost surely, 2^{2121201101031} is an apocalyptic number.

2121201101031 is a deficient number, since it is larger than the sum of its proper divisors (707694001617).

2121201101031 is an frugal number, since it uses more digits than its factorization.

2121201101031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33262 (or 27579 counting only the distinct ones).

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

Adding to 2121201101031 its reverse (1301011021212), we get a palindrome (3422212122243).

The spelling of 2121201101031 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one hundred one thousand, thirty-one".