21521123150010 has 32 divisors (see below), whose sum is σ = 56346213339072. Its totient is φ = 5217241975680.

The previous prime is 21521123149987. The next prime is 21521123150011. The reversal of 21521123150010 is 1005132112512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21521123150011) 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, 32607762019 + ... + 32607762678.

It is an arithmetic number, because the mean of its divisors is an integer number (1760819166846).

Almost surely, 2^{21521123150010} is an apocalyptic number.

21521123150010 is an abundant number, since it is smaller than the sum of its proper divisors (34825090189062).

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

21521123150010 is a wasteful number, since it uses less digits than its factorization.

21521123150010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65215524718.

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 21521123150010 its reverse (1005132112512), we get a palindrome (22526255262522).

The spelling of 21521123150010 in words is "twenty-one trillion, five hundred twenty-one billion, one hundred twenty-three million, one hundred fifty thousand, ten".