21621210433066 has 16 divisors (see below), whose sum is σ = 32683641059520. Its totient is φ = 10726684899840.

The previous prime is 21621210433019. The next prime is 21621210433073. The reversal of 21621210433066 is 66033401212612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3353751 + ... + 7381738.

It is an arithmetic number, because the mean of its divisors is an integer number (2042727566220).

Almost surely, 2^{21621210433066} is an apocalyptic number.

21621210433066 is a deficient number, since it is larger than the sum of its proper divisors (11062430626454).

21621210433066 is a wasteful number, since it uses less digits than its factorization.

21621210433066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10743309.

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 21621210433066 its reverse (66033401212612), we get a palindrome (87654611645678).

The spelling of 21621210433066 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred ten million, four hundred thirty-three thousand, sixty-six".