21121141551654 has 8 divisors (see below), whose sum is σ = 42242283103320. Its totient is φ = 7040380517216.

The previous prime is 21121141551649. The next prime is 21121141551659. The reversal of 21121141551654 is 45615514112112.

It is an interprime number because it is at equal distance from previous prime (21121141551649) and next prime (21121141551659).

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

21121141551654 is an admirable number.

It is a super-2 number, since 2×21121141551654² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121141551659) 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, 1760095129299 + ... + 1760095129310.

It is an arithmetic number, because the mean of its divisors is an integer number (5280285387915).

Almost surely, 2^{21121141551654} is an apocalyptic number.

21121141551654 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121141551654 is a wasteful number, since it uses less digits than its factorization.

21121141551654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520190258614.

The product of its digits is 48000, while the sum is 39.

Adding to 21121141551654 its reverse (45615514112112), we get a palindrome (66736655663766).

The spelling of 21121141551654 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred forty-one million, five hundred fifty-one thousand, six hundred fifty-four".