21203031490 has 8 divisors (see below), whose sum is σ = 38165456700. Its totient is φ = 8481212592.

The previous prime is 21203031449. The next prime is 21203031491. The reversal of 21203031490 is 9413030212.

It can be written as a sum of positive squares in 2 ways, for example, as 21014271369 + 188760121 = 144963^2 + 13739^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21203031491) 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 3 ways as a sum of consecutive naturals, for example, 1060151565 + ... + 1060151584.

Almost surely, 2^21203031490 is an apocalyptic number.

21203031490 is a deficient number, since it is larger than the sum of its proper divisors (16962425210).

21203031490 is a wasteful number, since it uses less digits than its factorization.

21203031490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120303156.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21203031490 in words is "twenty-one billion, two hundred three million, thirty-one thousand, four hundred ninety".