30021021031 has 4 divisors (see below), whose sum is σ = 30200787792. Its totient is φ = 29841254272.

The previous prime is 30021021029. The next prime is 30021021071. The reversal of 30021021031 is 13012012003.

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 30021021031 - 2¹ = 30021021029 is a prime.

It is a super-2 number, since 2×30021021031² (a number of 22 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 (30021021011) 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, 89883130 + ... + 89883463.

It is an arithmetic number, because the mean of its divisors is an integer number (7550196948).

Almost surely, 2^30021021031 is an apocalyptic number.

30021021031 is a deficient number, since it is larger than the sum of its proper divisors (179766761).

30021021031 is a wasteful number, since it uses less digits than its factorization.

30021021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179766760.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 30021021031 its reverse (13012012003), we get a palindrome (43033033034).

The spelling of 30021021031 in words is "thirty billion, twenty-one million, twenty-one thousand, thirty-one".