20400221211 has 16 divisors (see below), whose sum is σ = 28124143488. Its totient is φ = 13144424000.

The previous prime is 20400221183. The next prime is 20400221249. The reversal of 20400221211 is 11212200402.

It is a cyclic number.

It is not a de Polignac number, because 20400221211 - 2⁶ = 20400221147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20400221291) 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, 761865 + ... + 788186.

It is an arithmetic number, because the mean of its divisors is an integer number (1757758968).

Almost surely, 2^20400221211 is an apocalyptic number.

20400221211 is a deficient number, since it is larger than the sum of its proper divisors (7723922277).

20400221211 is a wasteful number, since it uses less digits than its factorization.

20400221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550202.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20400221211 its reverse (11212200402), we get a palindrome (31612421613).

The spelling of 20400221211 in words is "twenty billion, four hundred million, two hundred twenty-one thousand, two hundred eleven".