21451212002 has 32 divisors (see below), whose sum is σ = 37735649280. Its totient is φ = 9040816080.

The previous prime is 21451212001. The next prime is 21451212031. The reversal of 21451212002 is 20021215412.

It is not an unprimeable number, because it can be changed into a prime (21451212001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526298 + ... + 565589.

It is an arithmetic number, because the mean of its divisors is an integer number (1179239040).

Almost surely, 2^21451212002 is an apocalyptic number.

21451212002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21451212002 is a deficient number, since it is larger than the sum of its proper divisors (16284437278).

21451212002 is a wasteful number, since it uses less digits than its factorization.

21451212002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091966.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21451212002 its reverse (20021215412), we get a palindrome (41472427414).

The spelling of 21451212002 in words is "twenty-one billion, four hundred fifty-one million, two hundred twelve thousand, two".