211201210021 has 8 divisors (see below), whose sum is σ = 227487228320. Its totient is φ = 195432208272.

The previous prime is 211201210019. The next prime is 211201210069. The reversal of 211201210021 is 120012102112.

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

It is a cyclic number.

It is not a de Polignac number, because 211201210021 - 2¹ = 211201210019 is a prime.

It is a super-2 number, since 2×211201210021² (a number of 23 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 = 211201209983 and 211201210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211201210001) 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, 129253290 + ... + 129254923.

It is an arithmetic number, because the mean of its divisors is an integer number (28435903540).

Almost surely, 2^211201210021 is an apocalyptic number.

It is an amenable number.

211201210021 is a deficient number, since it is larger than the sum of its proper divisors (16286018299).

211201210021 is a wasteful number, since it uses less digits than its factorization.

211201210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258508275.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211201210021 its reverse (120012102112), we get a palindrome (331213312133).

The spelling of 211201210021 in words is "two hundred eleven billion, two hundred one million, two hundred ten thousand, twenty-one".