10120021011 has 18 divisors (see below), whose sum is σ = 15179270132. Its totient is φ = 6746676300.

The previous prime is 10120021003. The next prime is 10120021013. The reversal of 10120021011 is 11012002101.

It is a happy number.

It is not a de Polignac number, because 10120021011 - 2³ = 10120021003 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10120020984 and 10120021002.

It is not an unprimeable number, because it can be changed into a prime (10120021013) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 764665 + ... + 777786.

Almost surely, 2^10120021011 is an apocalyptic number.

10120021011 is a deficient number, since it is larger than the sum of its proper divisors (5059249121).

10120021011 is an frugal number, since it uses more digits than its factorization.

10120021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542475 (or 1542454 counting only the distinct ones).

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

Adding to 10120021011 its reverse (11012002101), we get a palindrome (21132023112).

The spelling of 10120021011 in words is "ten billion, one hundred twenty million, twenty-one thousand, eleven".