1001121010021 has 8 divisors (see below), whose sum is σ = 1092139367904. Its totient is φ = 910103878320.

The previous prime is 1001121010003. The next prime is 1001121010027. The reversal of 1001121010021 is 1200101211001.

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 1001121010021 - 2⁵ = 1001121009989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001121010027) 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, 2593450 + ... + 2954356.

It is an arithmetic number, because the mean of its divisors is an integer number (136517420988).

Almost surely, 2^{1001121010021} is an apocalyptic number.

1001121010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001121010021 is a deficient number, since it is larger than the sum of its proper divisors (91018357883).

1001121010021 is a wasteful number, since it uses less digits than its factorization.

1001121010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613091.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1001121010021 its reverse (1200101211001), we get a palindrome (2201222221022).

The spelling of 1001121010021 in words is "one trillion, one billion, one hundred twenty-one million, ten thousand, twenty-one".