20202121231 has 8 divisors (see below), whose sum is σ = 21089147904. Its totient is φ = 19315817400.

The previous prime is 20202121229. The next prime is 20202121271. The reversal of 20202121231 is 13212120202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20202121231 - 2¹ = 20202121229 is a prime.

It is a super-2 number, since 2×20202121231² (a number of 21 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 (20202121271) 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, 123195 + ... + 235756.

It is an arithmetic number, because the mean of its divisors is an integer number (2636143488).

Almost surely, 2^20202121231 is an apocalyptic number.

20202121231 is a deficient number, since it is larger than the sum of its proper divisors (887026673).

20202121231 is a wasteful number, since it uses less digits than its factorization.

20202121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361421.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20202121231 its reverse (13212120202), we get a palindrome (33414241433).

The spelling of 20202121231 in words is "twenty billion, two hundred two million, one hundred twenty-one thousand, two hundred thirty-one".