210021121121001 has 16 divisors (see below), whose sum is σ = 306064935525888. Its totient is φ = 127527056467200.

The previous prime is 210021121120961. The next prime is 210021121121011. The reversal of 210021121121001 is 100121121120012.

It is a happy number.

It is not a de Polignac number, because 210021121121001 - 2²² = 210021116926697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (210021121121011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66420340330 + ... + 66420343491.

It is an arithmetic number, because the mean of its divisors is an integer number (19129058470368).

Almost surely, 2^{210021121121001} is an apocalyptic number.

It is an amenable number.

210021121121001 is a deficient number, since it is larger than the sum of its proper divisors (96043814404887).

210021121121001 is a wasteful number, since it uses less digits than its factorization.

210021121121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132840683872.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 210021121121001 its reverse (100121121120012), we get a palindrome (310142242241013).

The spelling of 210021121121001 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one".