21501552200430 has 32 divisors (see below), whose sum is σ = 51873901867008. Its totient is φ = 5703727632800.

The previous prime is 21501552200417. The next prime is 21501552200431. The reversal of 21501552200430 is 3400225510512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21501552200431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1876220466 + ... + 1876231925.

It is an arithmetic number, because the mean of its divisors is an integer number (1621059433344).

Almost surely, 2^{21501552200430} is an apocalyptic number.

21501552200430 is an abundant number, since it is smaller than the sum of its proper divisors (30372349666578).

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

21501552200430 is a wasteful number, since it uses less digits than its factorization.

21501552200430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752452592.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21501552200430 its reverse (3400225510512), we get a palindrome (24901777710942).

The spelling of 21501552200430 in words is "twenty-one trillion, five hundred one billion, five hundred fifty-two million, two hundred thousand, four hundred thirty".