11221971547942 has 4 divisors (see below), whose sum is σ = 16832957321916. Its totient is φ = 5610985773970.

The previous prime is 11221971547937. The next prime is 11221971547957. The reversal of 11221971547942 is 24974517912211.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2805492886984 + ... + 2805492886987.

It is an arithmetic number, because the mean of its divisors is an integer number (4208239330479).

Almost surely, 2^{11221971547942} is an apocalyptic number.

11221971547942 is a deficient number, since it is larger than the sum of its proper divisors (5610985773974).

11221971547942 is an equidigital number, since it uses as much as digits as its factorization.

11221971547942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610985773973.

The product of its digits is 2540160, while the sum is 55.

The spelling of 11221971547942 in words is "eleven trillion, two hundred twenty-one billion, nine hundred seventy-one million, five hundred forty-seven thousand, nine hundred forty-two".