20210021121 has 8 divisors (see below), whose sum is σ = 27249467040. Its totient is φ = 13321961312.

The previous prime is 20210021059. The next prime is 20210021131. The reversal of 20210021121 is 12112001202.

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 20210021121 - 2²¹ = 20207923969 is a prime.

It is a super-2 number, since 2×20210021121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20210021097 and 20210021106.

It is not an unprimeable number, because it can be changed into a prime (20210021131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37846215 + ... + 37846748.

It is an arithmetic number, because the mean of its divisors is an integer number (3406183380).

Almost surely, 2^20210021121 is an apocalyptic number.

It is an amenable number.

20210021121 is a deficient number, since it is larger than the sum of its proper divisors (7039445919).

20210021121 is an equidigital number, since it uses as much as digits as its factorization.

20210021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75693055.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20210021121 its reverse (12112001202), we get a palindrome (32322022323).

The spelling of 20210021121 in words is "twenty billion, two hundred ten million, twenty-one thousand, one hundred twenty-one".