21002124001 has 8 divisors (see below), whose sum is σ = 22265548544. Its totient is φ = 19775320560.

The previous prime is 21002123971. The next prime is 21002124029. The reversal of 21002124001 is 10042120012.

It is a happy number.

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 21002124001 - 2⁷ = 21002123873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002124061) 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, 9154095 + ... + 9156388.

It is an arithmetic number, because the mean of its divisors is an integer number (2783193568).

Almost surely, 2^21002124001 is an apocalyptic number.

It is an amenable number.

21002124001 is a deficient number, since it is larger than the sum of its proper divisors (1263424543).

21002124001 is a wasteful number, since it uses less digits than its factorization.

21002124001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18310551.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002124001 its reverse (10042120012), we get a palindrome (31044244013).

The spelling of 21002124001 in words is "twenty-one billion, two million, one hundred twenty-four thousand, one".