21415200001 has 16 divisors (see below), whose sum is σ = 23704823296. Its totient is φ = 19221463296.

The previous prime is 21415199987. The next prime is 21415200007. The reversal of 21415200001 is 10000251412.

It is a cyclic number.

It is not a de Polignac number, because 21415200001 - 2²¹ = 21413102849 is a prime.

It is a super-2 number, since 2×21415200001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21415200007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38761 + ... + 210553.

It is an arithmetic number, because the mean of its divisors is an integer number (1481551456).

Almost surely, 2^21415200001 is an apocalyptic number.

It is an amenable number.

21415200001 is a deficient number, since it is larger than the sum of its proper divisors (2289623295).

21415200001 is a wasteful number, since it uses less digits than its factorization.

21415200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172072.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21415200001 its reverse (10000251412), we get a palindrome (31415451413).

The spelling of 21415200001 in words is "twenty-one billion, four hundred fifteen million, two hundred thousand, one".