21031212302 has 16 divisors (see below), whose sum is σ = 31850530992. Its totient is φ = 10414423680.

The previous prime is 21031212229. The next prime is 21031212361. The reversal of 21031212302 is 20321213012.

It is a super-2 number, since 2×21031212302² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 895988 + ... + 919160.

It is an arithmetic number, because the mean of its divisors is an integer number (1990658187).

Almost surely, 2^21031212302 is an apocalyptic number.

21031212302 is a deficient number, since it is larger than the sum of its proper divisors (10819318690).

21031212302 is a wasteful number, since it uses less digits than its factorization.

21031212302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27523.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21031212302 its reverse (20321213012), we get a palindrome (41352425314).

The spelling of 21031212302 in words is "twenty-one billion, thirty-one million, two hundred twelve thousand, three hundred two".