21838265561242 has 8 divisors (see below), whose sum is σ = 35277198214356. Its totient is φ = 10079199489792.

The previous prime is 21838265561213. The next prime is 21838265561249. The reversal of 21838265561242 is 24216556283812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21599544395961 + 238721165281 = 4647531^2 + 488591^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21838265561249) 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, 419966645383 + ... + 419966645434.

Almost surely, 2^{21838265561242} is an apocalyptic number.

21838265561242 is a deficient number, since it is larger than the sum of its proper divisors (13438932653114).

21838265561242 is a wasteful number, since it uses less digits than its factorization.

21838265561242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839933290832.

The product of its digits is 11059200, while the sum is 55.

The spelling of 21838265561242 in words is "twenty-one trillion, eight hundred thirty-eight billion, two hundred sixty-five million, five hundred sixty-one thousand, two hundred forty-two".