21031032434 has 8 divisors (see below), whose sum is σ = 32399158188. Its totient is φ = 10231313040.

The previous prime is 21031032409. The next prime is 21031032499. The reversal of 21031032434 is 43423013012.

It can be written as a sum of positive squares in 2 ways, for example, as 21029350225 + 1682209 = 145015^2 + 1297^2 .

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, 142101497 + ... + 142101644.

Almost surely, 2^21031032434 is an apocalyptic number.

21031032434 is a deficient number, since it is larger than the sum of its proper divisors (11368125754).

21031032434 is a wasteful number, since it uses less digits than its factorization.

21031032434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284203180.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21031032434 its reverse (43423013012), we get a palindrome (64454045446).

The spelling of 21031032434 in words is "twenty-one billion, thirty-one million, thirty-two thousand, four hundred thirty-four".