21090527217418 has 8 divisors (see below), whose sum is σ = 31796378597412. Its totient is φ = 10491734351616.

The previous prime is 21090527217349. The next prime is 21090527217427. The reversal of 21090527217418 is 81471272509012.

It can be written as a sum of positive squares in 2 ways, for example, as 13399794688329 + 7690732529089 = 3660573^2 + 2773217^2 .

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, 26764628055 + ... + 26764628842.

Almost surely, 2^{21090527217418} is an apocalyptic number.

21090527217418 is a deficient number, since it is larger than the sum of its proper divisors (10705851379994).

21090527217418 is a wasteful number, since it uses less digits than its factorization.

21090527217418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53529257096.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 21090527217418 in words is "twenty-one trillion, ninety billion, five hundred twenty-seven million, two hundred seventeen thousand, four hundred eighteen".