10001311212121 has 4 divisors (see below), whose sum is σ = 10002998633472. Its totient is φ = 9999623790772.

The previous prime is 10001311212107. The next prime is 10001311212149. The reversal of 10001311212121 is 12121211310001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10001311212121 - 2¹⁹ = 10001310687833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001311212095 and 10001311212104.

It is not an unprimeable number, because it can be changed into a prime (10001311213121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843701785 + ... + 843713638.

It is an arithmetic number, because the mean of its divisors is an integer number (2500749658368).

Almost surely, 2^{10001311212121} is an apocalyptic number.

It is an amenable number.

10001311212121 is a deficient number, since it is larger than the sum of its proper divisors (1687421351).

10001311212121 is an equidigital number, since it uses as much as digits as its factorization.

10001311212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687421350.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 10001311212121 its reverse (12121211310001), we get a palindrome (22122522522122).

The spelling of 10001311212121 in words is "ten trillion, one billion, three hundred eleven million, two hundred twelve thousand, one hundred twenty-one".