21001283407 has 8 divisors (see below), whose sum is σ = 22650992000. Its totient is φ = 19356464160.

The previous prime is 21001283393. The next prime is 21001283419. The reversal of 21001283407 is 70438210012.

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 21001283407 - 2²³ = 20992894799 is a prime.

It is a super-2 number, since 2×21001283407² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001283437) 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, 1213407 + ... + 1230592.

It is an arithmetic number, because the mean of its divisors is an integer number (2831374000).

Almost surely, 2^21001283407 is an apocalyptic number.

21001283407 is a deficient number, since it is larger than the sum of its proper divisors (1649708593).

21001283407 is a wasteful number, since it uses less digits than its factorization.

21001283407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444673.

The product of its (nonzero) digits is 2688, while the sum is 28.

Adding to 21001283407 its reverse (70438210012), we get a palindrome (91439493419).

The spelling of 21001283407 in words is "twenty-one billion, one million, two hundred eighty-three thousand, four hundred seven".