21220133210987 has 2 divisors, whose sum is σ = 21220133210988. Its totient is φ = 21220133210986.

The previous prime is 21220133210951. The next prime is 21220133211041. The reversal of 21220133210987 is 78901233102212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220133210987 - 2⁶ = 21220133210923 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220133260987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610066605493 + 10610066605494.

It is an arithmetic number, because the mean of its divisors is an integer number (10610066605494).

Almost surely, 2^{21220133210987} is an apocalyptic number.

21220133210987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220133210987 is an equidigital number, since it uses as much as digits as its factorization.

21220133210987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21220133210987 in words is "twenty-one trillion, two hundred twenty billion, one hundred thirty-three million, two hundred ten thousand, nine hundred eighty-seven".