211220211202021 has 16 divisors (see below), whose sum is σ = 254911321744000. Its totient is φ = 170969185790208.

The previous prime is 211220211202019. The next prime is 211220211202061. The reversal of 211220211202021 is 120202112022112.

It is a cyclic number.

It is not a de Polignac number, because 211220211202021 - 2¹ = 211220211202019 is a prime.

It is a super-2 number, since 2×211220211202021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211220211202021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220211202061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2536894296 + ... + 2536977553.

It is an arithmetic number, because the mean of its divisors is an integer number (15931957609000).

Almost surely, 2^{211220211202021} is an apocalyptic number.

It is an amenable number.

211220211202021 is a deficient number, since it is larger than the sum of its proper divisors (43691110541979).

211220211202021 is a wasteful number, since it uses less digits than its factorization.

211220211202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073872188.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211220211202021 its reverse (120202112022112), we get a palindrome (331422323224133).

The spelling of 211220211202021 in words is "two hundred eleven trillion, two hundred twenty billion, two hundred eleven million, two hundred two thousand, twenty-one".