20202121031 has 4 divisors (see below), whose sum is σ = 20335910064. Its totient is φ = 20068332000.

The previous prime is 20202121007. The next prime is 20202121057. The reversal of 20202121031 is 13012120202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20202121031 - 2³⁴ = 3022251847 is a prime.

It is a super-2 number, since 2×20202121031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202120997 and 20202121015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202121631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66894290 + ... + 66894591.

It is an arithmetic number, because the mean of its divisors is an integer number (5083977516).

Almost surely, 2^20202121031 is an apocalyptic number.

20202121031 is a deficient number, since it is larger than the sum of its proper divisors (133789033).

20202121031 is a wasteful number, since it uses less digits than its factorization.

20202121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133789032.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20202121031 its reverse (13012120202), we get a palindrome (33214241233).

The spelling of 20202121031 in words is "twenty billion, two hundred two million, one hundred twenty-one thousand, thirty-one".