21212020001211 has 32 divisors (see below), whose sum is σ = 31589570376000. Its totient is φ = 12571028510208.

The previous prime is 21212020001203. The next prime is 21212020001243. The reversal of 21212020001211 is 11210002021212.

It is not a de Polignac number, because 21212020001211 - 2³ = 21212020001203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212020001611) 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, 23666856 + ... + 24546773.

It is an arithmetic number, because the mean of its divisors is an integer number (987174074250).

Almost surely, 2^{21212020001211} is an apocalyptic number.

21212020001211 is a deficient number, since it is larger than the sum of its proper divisors (10377550374789).

21212020001211 is a wasteful number, since it uses less digits than its factorization.

21212020001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48214063.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212020001211 its reverse (11210002021212), we get a palindrome (32422022022423).

The spelling of 21212020001211 in words is "twenty-one trillion, two hundred twelve billion, twenty million, one thousand, two hundred eleven".