21203031492 has 36 divisors (see below), whose sum is σ = 53937945516. Its totient is φ = 7022658240.

The previous prime is 21203031491. The next prime is 21203031497. The reversal of 21203031492 is 29413030212.

It is a happy number.

21203031492 is a `hidden beast` number, since 212 + 0 + 303 + 149 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14243467716 + 6959563776 = 119346^2 + 83424^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 1870059 + ... + 1881362.

Almost surely, 2^21203031492 is an apocalyptic number.

It is an amenable number.

21203031492 is an abundant number, since it is smaller than the sum of its proper divisors (32734914024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203031492 is a wasteful number, since it uses less digits than its factorization.

21203031492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751588 (or 3751583 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The spelling of 21203031492 in words is "twenty-one billion, two hundred three million, thirty-one thousand, four hundred ninety-two".