21321035510 has 8 divisors (see below), whose sum is σ = 38377863936. Its totient is φ = 8528414200.

The previous prime is 21321035501. The next prime is 21321035521. The reversal of 21321035510 is 1553012312.

It is a happy number.

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

It is a congruent number.

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, 1066051766 + ... + 1066051785.

It is an arithmetic number, because the mean of its divisors is an integer number (4797232992).

Almost surely, 2^21321035510 is an apocalyptic number.

21321035510 is a deficient number, since it is larger than the sum of its proper divisors (17056828426).

21321035510 is a wasteful number, since it uses less digits than its factorization.

21321035510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132103558.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21321035510 its reverse (1553012312), we get a palindrome (22874047822).

The spelling of 21321035510 in words is "twenty-one billion, three hundred twenty-one million, thirty-five thousand, five hundred ten".