21121000120019 has 8 divisors (see below), whose sum is σ = 21585228582720. Its totient is φ = 20657390219136.

The previous prime is 21121000120009. The next prime is 21121000120091. The reversal of 21121000120019 is 91002100012112.

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 21121000120019 - 2¹² = 21121000115923 is a prime.

It is a super-2 number, since 2×21121000120019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121000120009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154571414 + ... + 154707995.

It is an arithmetic number, because the mean of its divisors is an integer number (2698153572840).

Almost surely, 2^{21121000120019} is an apocalyptic number.

21121000120019 is a deficient number, since it is larger than the sum of its proper divisors (464228462701).

21121000120019 is a wasteful number, since it uses less digits than its factorization.

21121000120019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309280909.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 21121000120019 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty thousand, nineteen".