20111203021 has 8 divisors (see below), whose sum is σ = 24752249984. Its totient is φ = 15912160560.

The previous prime is 20111203019. The next prime is 20111203037. The reversal of 20111203021 is 12030211102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20111203021 - 2¹ = 20111203019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20111202992 and 20111203010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111243021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110501025 + ... + 110501206.

It is an arithmetic number, because the mean of its divisors is an integer number (3094031248).

Almost surely, 2^20111203021 is an apocalyptic number.

It is an amenable number.

20111203021 is a deficient number, since it is larger than the sum of its proper divisors (4641046963).

20111203021 is a wasteful number, since it uses less digits than its factorization.

20111203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221002251.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20111203021 its reverse (12030211102), we get a palindrome (32141414123).

The spelling of 20111203021 in words is "twenty billion, one hundred eleven million, two hundred three thousand, twenty-one".