1001121100021 has 32 divisors (see below), whose sum is σ = 1175601816576. Its totient is φ = 834675408000.

The previous prime is 1001121100019. The next prime is 1001121100033. The reversal of 1001121100021 is 1200011211001.

It is not a de Polignac number, because 1001121100021 - 2¹ = 1001121100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001121099980 and 1001121100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001121100121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254671426 + ... + 254675356.

It is an arithmetic number, because the mean of its divisors is an integer number (36737556768).

Almost surely, 2^{1001121100021} is an apocalyptic number.

It is an amenable number.

1001121100021 is a deficient number, since it is larger than the sum of its proper divisors (174480716555).

1001121100021 is a wasteful number, since it uses less digits than its factorization.

1001121100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7273.

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

Adding to 1001121100021 its reverse (1200011211001), we get a palindrome (2201132311022).

The spelling of 1001121100021 in words is "one trillion, one billion, one hundred twenty-one million, one hundred thousand, twenty-one".