21988475345090 has 8 divisors (see below), whose sum is σ = 39579255621180. Its totient is φ = 8795390138032.

The previous prime is 21988475345047. The next prime is 21988475345107. The reversal of 21988475345090 is 9054357488912.

It can be written as a sum of positive squares in 2 ways, for example, as 21616818073321 + 371657271769 = 4649389^2 + 609637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099423767245 + ... + 1099423767264.

Almost surely, 2^{21988475345090} is an apocalyptic number.

21988475345090 is a deficient number, since it is larger than the sum of its proper divisors (17590780276090).

21988475345090 is a wasteful number, since it uses less digits than its factorization.

21988475345090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198847534516.

The product of its (nonzero) digits is 87091200, while the sum is 65.

The spelling of 21988475345090 in words is "twenty-one trillion, nine hundred eighty-eight billion, four hundred seventy-five million, three hundred forty-five thousand, ninety".