120021001011 has 48 divisors (see below), whose sum is σ = 185663821824. Its totient is φ = 74447361792.

The previous prime is 120021001007. The next prime is 120021001057. The reversal of 120021001011 is 110100120021.

It is a happy number.

It is not a de Polignac number, because 120021001011 - 2² = 120021001007 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 = 120021000984 and 120021001002.

It is not an unprimeable number, because it can be changed into a prime (120021001091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9559440 + ... + 9571986.

It is an arithmetic number, because the mean of its divisors is an integer number (3867996288).

Almost surely, 2^120021001011 is an apocalyptic number.

120021001011 is a deficient number, since it is larger than the sum of its proper divisors (65642820813).

120021001011 is a wasteful number, since it uses less digits than its factorization.

120021001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13280 (or 13277 counting only the distinct ones).

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

Adding to 120021001011 its reverse (110100120021), we get a palindrome (230121121032).

The spelling of 120021001011 in words is "one hundred twenty billion, twenty-one million, one thousand, eleven".