21020101021211 has 8 divisors (see below), whose sum is σ = 21025077819648. Its totient is φ = 21015124641000.

The previous prime is 21020101021111. The next prime is 21020101021279. The reversal of 21020101021211 is 11212010102012.

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 21020101021211 - 2¹⁸ = 21020100759067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020101021111) 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, 115105706 + ... + 115288176.

It is an arithmetic number, because the mean of its divisors is an integer number (2628134727456).

Almost surely, 2^{21020101021211} is an apocalyptic number.

21020101021211 is a deficient number, since it is larger than the sum of its proper divisors (4976798437).

21020101021211 is a wasteful number, since it uses less digits than its factorization.

21020101021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209113.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21020101021211 its reverse (11212010102012), we get a palindrome (32232111123223).

The spelling of 21020101021211 in words is "twenty-one trillion, twenty billion, one hundred one million, twenty-one thousand, two hundred eleven".