211020121010221 has 8 divisors (see below), whose sum is σ = 212238440200800. Its totient is φ = 209802239995920.

The previous prime is 211020121010159. The next prime is 211020121010233. The reversal of 211020121010221 is 122010121020112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211020121010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020121010195 and 211020121010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020121010521) 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, 108578091 + ... + 110504488.

It is an arithmetic number, because the mean of its divisors is an integer number (26529805025100).

Almost surely, 2^{211020121010221} is an apocalyptic number.

It is an amenable number.

211020121010221 is a deficient number, since it is larger than the sum of its proper divisors (1218319190579).

211020121010221 is a wasteful number, since it uses less digits than its factorization.

211020121010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219088139.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211020121010221 its reverse (122010121020112), we get a palindrome (333030242030333).

The spelling of 211020121010221 in words is "two hundred eleven trillion, twenty billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".