1120001001021 has 24 divisors (see below), whose sum is σ = 1848974909184. Its totient is φ = 639971367840.

The previous prime is 1120001001011. The next prime is 1120001001029. The reversal of 1120001001021 is 1201001000211.

It is a happy number.

It is not a de Polignac number, because 1120001001021 - 2¹³ = 1120000992829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1120001000994 and 1120001001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120001001029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1025740 + ... + 1814426.

It is an arithmetic number, because the mean of its divisors is an integer number (77040621216).

Almost surely, 2^{1120001001021} is an apocalyptic number.

It is an amenable number.

1120001001021 is a deficient number, since it is larger than the sum of its proper divisors (728973908163).

1120001001021 is a wasteful number, since it uses less digits than its factorization.

1120001001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811241 (or 811238 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1120001001021 its reverse (1201001000211), we get a palindrome (2321002001232).

The spelling of 1120001001021 in words is "one trillion, one hundred twenty billion, one million, one thousand, twenty-one".