210021211022021 has 4 divisors (see below), whose sum is σ = 240024241168032. Its totient is φ = 180018180876012.

The previous prime is 210021211021997. The next prime is 210021211022087. The reversal of 210021211022021 is 120220112120012.

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 210021211022021 - 2⁶ = 210021211021957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021211024021) 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, 15001515072995 + ... + 15001515073008.

It is an arithmetic number, because the mean of its divisors is an integer number (60006060292008).

Almost surely, 2^{210021211022021} is an apocalyptic number.

It is an amenable number.

210021211022021 is a deficient number, since it is larger than the sum of its proper divisors (30003030146011).

210021211022021 is an equidigital number, since it uses as much as digits as its factorization.

210021211022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30003030146010.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210021211022021 its reverse (120220112120012), we get a palindrome (330241323142033).

The spelling of 210021211022021 in words is "two hundred ten trillion, twenty-one billion, two hundred eleven million, twenty-two thousand, twenty-one".