21122195494 has 8 divisors (see below), whose sum is σ = 31717400760. Its totient is φ = 10549728576.

The previous prime is 21122195491. The next prime is 21122195527. The reversal of 21122195494 is 49459122112.

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

It is a super-2 number, since 2×21122195494² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122195491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5682264 + ... + 5685979.

It is an arithmetic number, because the mean of its divisors is an integer number (3964675095).

Almost surely, 2^21122195494 is an apocalyptic number.

21122195494 is a deficient number, since it is larger than the sum of its proper divisors (10595205266).

21122195494 is a wasteful number, since it uses less digits than its factorization.

21122195494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11369174.

The product of its digits is 51840, while the sum is 40.

The spelling of 21122195494 in words is "twenty-one billion, one hundred twenty-two million, one hundred ninety-five thousand, four hundred ninety-four".