210021011122021 has 4 divisors (see below), whose sum is σ = 229113830314944. Its totient is φ = 190928191929100.

The previous prime is 210021011122001. The next prime is 210021011122033. The reversal of 210021011122021 is 120221110120012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210021011122021 - 2¹⁷ = 210021010990949 is a prime.

It is a super-2 number, since 2×210021011122021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021011121986 and 210021011122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021011122001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9546409596445 + ... + 9546409596466.

It is an arithmetic number, because the mean of its divisors is an integer number (57278457578736).

Almost surely, 2^{210021011122021} is an apocalyptic number.

It is an amenable number.

210021011122021 is a deficient number, since it is larger than the sum of its proper divisors (19092819192923).

210021011122021 is a wasteful number, since it uses less digits than its factorization.

210021011122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19092819192922.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210021011122021 its reverse (120221110120012), we get a palindrome (330242121242033).

It can be divided in two parts, 2100210 and 11122021, that added together give a palindrome (13222231).

The spelling of 210021011122021 in words is "two hundred ten trillion, twenty-one billion, eleven million, one hundred twenty-two thousand, twenty-one".