21020001211 has 8 divisors (see below), whose sum is σ = 22946644800. Its totient is φ = 19095980040.

The previous prime is 21020001209. The next prime is 21020001227. The reversal of 21020001211 is 11210002012.

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 21020001211 - 2¹ = 21020001209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020001251) 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, 638821 + ... + 670918.

It is an arithmetic number, because the mean of its divisors is an integer number (2868330600).

Almost surely, 2^21020001211 is an apocalyptic number.

21020001211 is a deficient number, since it is larger than the sum of its proper divisors (1926643589).

21020001211 is a wasteful number, since it uses less digits than its factorization.

21020001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311209.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21020001211 its reverse (11210002012), we get a palindrome (32230003223).

The spelling of 21020001211 in words is "twenty-one billion, twenty million, one thousand, two hundred eleven".