1291023210121 has 8 divisors (see below), whose sum is σ = 1305000785088. Its totient is φ = 1277069070000.

The previous prime is 1291023210089. The next prime is 1291023210131. The reversal of 1291023210121 is 1210123201921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1291023210121 - 2⁵ = 1291023210089 is a prime.

It is a super-2 number, since 2×1291023210121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291023210131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5747925 + ... + 5968306.

It is an arithmetic number, because the mean of its divisors is an integer number (163125098136).

Almost surely, 2^{1291023210121} is an apocalyptic number.

It is an amenable number.

1291023210121 is a deficient number, since it is larger than the sum of its proper divisors (13977574967).

1291023210121 is a wasteful number, since it uses less digits than its factorization.

1291023210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11717423.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 1291023210121 in words is "one trillion, two hundred ninety-one billion, twenty-three million, two hundred ten thousand, one hundred twenty-one".