202121011021 has 8 divisors (see below), whose sum is σ = 207072645120. Its totient is φ = 197196509808.

The previous prime is 202121010997. The next prime is 202121011033. The reversal of 202121011021 is 120110121202.

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-202121011021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202121010992 and 202121011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121011051) 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, 6768141 + ... + 6797938.

It is an arithmetic number, because the mean of its divisors is an integer number (25884080640).

Almost surely, 2^202121011021 is an apocalyptic number.

It is an amenable number.

202121011021 is a deficient number, since it is larger than the sum of its proper divisors (4951634099).

202121011021 is a wasteful number, since it uses less digits than its factorization.

202121011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13566443.

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

Adding to 202121011021 its reverse (120110121202), we get a palindrome (322231132223).

The spelling of 202121011021 in words is "two hundred two billion, one hundred twenty-one million, eleven thousand, twenty-one".