21151036121 has 8 divisors (see below), whose sum is σ = 21321425664. Its totient is φ = 20980782160.

The previous prime is 21151036111. The next prime is 21151036129. The reversal of 21151036121 is 12163015112.

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

It is a cyclic number.

It is not a de Polignac number, because 21151036121 - 2¹⁸ = 21150773977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21151036129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291896 + ... + 357078.

It is an arithmetic number, because the mean of its divisors is an integer number (2665178208).

Almost surely, 2^21151036121 is an apocalyptic number.

It is an amenable number.

21151036121 is a deficient number, since it is larger than the sum of its proper divisors (170389543).

21151036121 is a wasteful number, since it uses less digits than its factorization.

21151036121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67791.

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 21151036121 in words is "twenty-one billion, one hundred fifty-one million, thirty-six thousand, one hundred twenty-one".