21020501200001 has 32 divisors (see below), whose sum is σ = 22375713964032. Its totient is φ = 19716164902080.

The previous prime is 21020501199977. The next prime is 21020501200007. The reversal of 21020501200001 is 10000210502012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020501200001 is a prime.

It is a super-2 number, since 2×21020501200001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21020501200007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442261700 + ... + 442309226.

It is an arithmetic number, because the mean of its divisors is an integer number (699241061376).

Almost surely, 2^{21020501200001} is an apocalyptic number.

It is an amenable number.

21020501200001 is a deficient number, since it is larger than the sum of its proper divisors (1355212764031).

21020501200001 is a wasteful number, since it uses less digits than its factorization.

21020501200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50549.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 21020501200001 its reverse (10000210502012), we get a palindrome (31020711702013).

The spelling of 21020501200001 in words is "twenty-one trillion, twenty billion, five hundred one million, two hundred thousand, one".