21031213010 has 8 divisors (see below), whose sum is σ = 37856183436. Its totient is φ = 8412485200.

The previous prime is 21031213003. The next prime is 21031213067. The reversal of 21031213010 is 1031213012.

It can be written as a sum of positive squares in 2 ways, for example, as 18517494241 + 2513718769 = 136079^2 + 50137^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051560641 + ... + 1051560660.

Almost surely, 2^21031213010 is an apocalyptic number.

21031213010 is a deficient number, since it is larger than the sum of its proper divisors (16824970426).

21031213010 is a wasteful number, since it uses less digits than its factorization.

21031213010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103121308.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21031213010 its reverse (1031213012), we get a palindrome (22062426022).

It can be divided in two parts, 210312 and 13010, that added together give a palindrome (223322).

The spelling of 21031213010 in words is "twenty-one billion, thirty-one million, two hundred thirteen thousand, ten".