1201023021 has 24 divisors (see below), whose sum is σ = 1855763424. Its totient is φ = 685070080.

The previous prime is 1201023011. The next prime is 1201023029. The reversal of 1201023021 is 1203201021.

It is not a de Polignac number, because 1201023021 - 2¹⁸ = 1200760877 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1201022988 and 1201023006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201023029) 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, 53430 + ... + 72503.

It is an arithmetic number, because the mean of its divisors is an integer number (77323476).

Almost surely, 2^1201023021 is an apocalyptic number.

1201023021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201023021 is a deficient number, since it is larger than the sum of its proper divisors (654740403).

1201023021 is a wasteful number, since it uses less digits than its factorization.

1201023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125981 (or 125964 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1201023021 is about 34655.7790418856. The cubic root of 1201023021 is about 1062.9604617515.

Adding to 1201023021 its reverse (1203201021), we get a palindrome (2404224042).

The spelling of 1201023021 in words is "one billion, two hundred one million, twenty-three thousand, twenty-one".