210002120400021 has 8 divisors (see below), whose sum is σ = 280016655264000. Its totient is φ = 139994499568032.

The previous prime is 210002120399987. The next prime is 210002120400029. The reversal of 210002120400021 is 120004021200012.

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

It is not a de Polignac number, because 210002120400021 - 2⁶ = 210002120399957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002120400029) 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, 1728437125 + ... + 1728558618.

It is an arithmetic number, because the mean of its divisors is an integer number (35002081908000).

Almost surely, 2^{210002120400021} is an apocalyptic number.

It is an amenable number.

210002120400021 is a deficient number, since it is larger than the sum of its proper divisors (70014534863979).

210002120400021 is a wasteful number, since it uses less digits than its factorization.

210002120400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3457015995.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 210002120400021 its reverse (120004021200012), we get a palindrome (330006141600033).

The spelling of 210002120400021 in words is "two hundred ten trillion, two billion, one hundred twenty million, four hundred thousand, twenty-one".