30031202021 has 4 divisors (see below), whose sum is σ = 30729602112. Its totient is φ = 29332801932.

The previous prime is 30031201961. The next prime is 30031202023. The reversal of 30031202021 is 12020213003.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12020213003 = 17183 ⋅699541.

It is a cyclic number.

It is not a de Polignac number, because 30031202021 - 2¹⁴ = 30031185637 is a prime.

It is a super-2 number, since 2×30031202021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30031201987 and 30031202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30031202023) 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, 349199981 + ... + 349200066.

It is an arithmetic number, because the mean of its divisors is an integer number (7682400528).

Almost surely, 2^30031202021 is an apocalyptic number.

It is an amenable number.

30031202021 is a deficient number, since it is larger than the sum of its proper divisors (698400091).

30031202021 is an equidigital number, since it uses as much as digits as its factorization.

30031202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698400090.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 30031202021 its reverse (12020213003), we get a palindrome (42051415024).

It can be divided in two parts, 3003 and 1202021, that multiplied together give a palindrome (3609669063).

The spelling of 30031202021 in words is "thirty billion, thirty-one million, two hundred two thousand, twenty-one".