21012119 has 8 divisors (see below), whose sum is σ = 23419440. Its totient is φ = 18734976.

The previous prime is 21012091. The next prime is 21012127. The reversal of 21012119 is 91121012.

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 21012119 - 2¹² = 21008023 is a prime.

It is a super-2 number, since 2×21012119² = 883018289740322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012097 and 21012106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012419) 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, 32204 + ... + 32849.

It is an arithmetic number, because the mean of its divisors is an integer number (2927430).

Almost surely, 2^21012119 is an apocalyptic number.

21012119 is a deficient number, since it is larger than the sum of its proper divisors (2407321).

21012119 is a wasteful number, since it uses less digits than its factorization.

21012119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65089.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21012119 is about 4583.8977955447. The cubic root of 21012119 is about 275.9454794990.

The spelling of 21012119 in words is "twenty-one million, twelve thousand, one hundred nineteen".