21461158222207 has 4 divisors (see below), whose sum is σ = 23412172606056. Its totient is φ = 19510143838360.

The previous prime is 21461158222201. The next prime is 21461158222303. The reversal of 21461158222207 is 70222285116412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21461158222207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461158222201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975507191908 + ... + 975507191929.

It is an arithmetic number, because the mean of its divisors is an integer number (5853043151514).

Almost surely, 2^{21461158222207} is an apocalyptic number.

21461158222207 is a deficient number, since it is larger than the sum of its proper divisors (1951014383849).

21461158222207 is a wasteful number, since it uses less digits than its factorization.

21461158222207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951014383848.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 21461158222207 in words is "twenty-one trillion, four hundred sixty-one billion, one hundred fifty-eight million, two hundred twenty-two thousand, two hundred seven".