21150033401 has 4 divisors (see below), whose sum is σ = 24171466752. Its totient is φ = 18128600052.

The previous prime is 21150033397. The next prime is 21150033409. The reversal of 21150033401 is 10433005112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21150033401 - 2² = 21150033397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21150033409) 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, 1510716665 + ... + 1510716678.

It is an arithmetic number, because the mean of its divisors is an integer number (6042866688).

Almost surely, 2^21150033401 is an apocalyptic number.

It is an amenable number.

21150033401 is a deficient number, since it is larger than the sum of its proper divisors (3021433351).

21150033401 is an equidigital number, since it uses as much as digits as its factorization.

21150033401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021433350.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21150033401 its reverse (10433005112), we get a palindrome (31583038513).

The spelling of 21150033401 in words is "twenty-one billion, one hundred fifty million, thirty-three thousand, four hundred one".