1001121120021 has 16 divisors (see below), whose sum is σ = 1456220179008. Its totient is φ = 606721737600.

The previous prime is 1001121120007. The next prime is 1001121120133. The reversal of 1001121120021 is 1200211211001.

It is not a de Polignac number, because 1001121120021 - 2⁵ = 1001121119989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001121119979 and 1001121120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001121122021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 693385 + ... + 1575761.

It is an arithmetic number, because the mean of its divisors is an integer number (91013761188).

Almost surely, 2^{1001121120021} is an apocalyptic number.

1001121120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001121120021 is a deficient number, since it is larger than the sum of its proper divisors (455099058987).

1001121120021 is a wasteful number, since it uses less digits than its factorization.

1001121120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916772.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001121120021 its reverse (1200211211001), we get a palindrome (2201332331022).

The spelling of 1001121120021 in words is "one trillion, one billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".