30102102021 has 16 divisors (see below), whose sum is σ = 42964646400. Its totient is φ = 18689617008.

The previous prime is 30102102007. The next prime is 30102102031. The reversal of 30102102021 is 12020120103.

30102102021 = T₁₈₆₇₈ + T₁₈₆₇₉ + ... + T₁₈₈₄₈.

It is not a de Polignac number, because 30102102021 - 2¹³ = 30102093829 is a prime.

It is a super-2 number, since 2×30102102021² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30102101988 and 30102102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30102102001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4472121 + ... + 4478846.

It is an arithmetic number, because the mean of its divisors is an integer number (2685290400).

Almost surely, 2^30102102021 is an apocalyptic number.

It is an amenable number.

30102102021 is a deficient number, since it is larger than the sum of its proper divisors (12862544379).

30102102021 is a wasteful number, since it uses less digits than its factorization.

30102102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8951048.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 30102102021 its reverse (12020120103), we get a palindrome (42122222124).

The spelling of 30102102021 in words is "thirty billion, one hundred two million, one hundred two thousand, twenty-one".