211221001022021 has 8 divisors (see below), whose sum is σ = 211585925434464. Its totient is φ = 210856341147760.

The previous prime is 211221001021981. The next prime is 211221001022029. The reversal of 211221001022021 is 120220100122112.

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-211221001022021 is a prime.

It is a super-2 number, since 2×211221001022021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221001022029) 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, 64536230 + ... + 67730103.

It is an arithmetic number, because the mean of its divisors is an integer number (26448240679308).

Almost surely, 2^{211221001022021} is an apocalyptic number.

It is an amenable number.

211221001022021 is a deficient number, since it is larger than the sum of its proper divisors (364924412443).

211221001022021 is a wasteful number, since it uses less digits than its factorization.

211221001022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132269091.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211221001022021 its reverse (120220100122112), we get a palindrome (331441101144133).

The spelling of 211221001022021 in words is "two hundred eleven trillion, two hundred twenty-one billion, one million, twenty-two thousand, twenty-one".