21050032455 has 48 divisors (see below), whose sum is σ = 39646064640. Its totient is φ = 10292702400.

The previous prime is 21050032429. The next prime is 21050032459. The reversal of 21050032455 is 55423005012.

It is a happy number.

It is not a de Polignac number, because 21050032455 - 2¹³ = 21050024263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050032459) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 370591 + ... + 423600.

It is an arithmetic number, because the mean of its divisors is an integer number (825959680).

Almost surely, 2^21050032455 is an apocalyptic number.

21050032455 is a deficient number, since it is larger than the sum of its proper divisors (18596032185).

21050032455 is a wasteful number, since it uses less digits than its factorization.

21050032455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794252 (or 794249 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 21050032455 its reverse (55423005012), we get a palindrome (76473037467).

The spelling of 21050032455 in words is "twenty-one billion, fifty million, thirty-two thousand, four hundred fifty-five".