210211110021 has 48 divisors (see below), whose sum is σ = 326337669504. Its totient is φ = 119856000000.

The previous prime is 210211110013. The next prime is 210211110029. The reversal of 210211110021 is 120011112012.

It is an interprime number because it is at equal distance from previous prime (210211110013) and next prime (210211110029).

It is not a de Polignac number, because 210211110021 - 2³ = 210211110013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210211109979 and 210211110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211110029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18513496 + ... + 18524846.

It is an arithmetic number, because the mean of its divisors is an integer number (6798701448).

Almost surely, 2^210211110021 is an apocalyptic number.

It is an amenable number.

210211110021 is a deficient number, since it is larger than the sum of its proper divisors (116126559483).

210211110021 is a wasteful number, since it uses less digits than its factorization.

210211110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14394 (or 14383 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 210211110021 its reverse (120011112012), we get a palindrome (330222222033).

The spelling of 210211110021 in words is "two hundred ten billion, two hundred eleven million, one hundred ten thousand, twenty-one".