21243419774 has 8 divisors (see below), whose sum is σ = 32606179320. Its totient is φ = 10374693336.

The previous prime is 21243419767. The next prime is 21243419783. The reversal of 21243419774 is 47791434212.

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

It is a super-2 number, since 2×21243419774² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 123508169 + ... + 123508340.

It is an arithmetic number, because the mean of its divisors is an integer number (4075772415).

Almost surely, 2^21243419774 is an apocalyptic number.

21243419774 is a deficient number, since it is larger than the sum of its proper divisors (11362759546).

21243419774 is a wasteful number, since it uses less digits than its factorization.

21243419774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247016554.

The product of its digits is 338688, while the sum is 44.

The spelling of 21243419774 in words is "twenty-one billion, two hundred forty-three million, four hundred nineteen thousand, seven hundred seventy-four".