211021012221 has 8 divisors (see below), whose sum is σ = 282355560480. Its totient is φ = 140183569392.

The previous prime is 211021012217. The next prime is 211021012259. The reversal of 211021012221 is 122210120112.

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

It is not a de Polignac number, because 211021012221 - 2² = 211021012217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211021012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021012271) 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, 124275366 + ... + 124277063.

It is an arithmetic number, because the mean of its divisors is an integer number (35294445060).

Almost surely, 2^211021012221 is an apocalyptic number.

It is an amenable number.

211021012221 is a deficient number, since it is larger than the sum of its proper divisors (71334548259).

211021012221 is a wasteful number, since it uses less digits than its factorization.

211021012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248552715.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211021012221 its reverse (122210120112), we get a palindrome (333231132333).

The spelling of 211021012221 in words is "two hundred eleven billion, twenty-one million, twelve thousand, two hundred twenty-one".