210020021205 has 16 divisors (see below), whose sum is σ = 336045081024. Its totient is φ = 112006328960.

The previous prime is 210020021153. The next prime is 210020021221. The reversal of 210020021205 is 502120020012.

It is not a de Polignac number, because 210020021205 - 2¹⁹ = 210019496917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148345 + ... + 664865.

It is an arithmetic number, because the mean of its divisors is an integer number (21002817564).

Almost surely, 2^210020021205 is an apocalyptic number.

It is an amenable number.

210020021205 is a deficient number, since it is larger than the sum of its proper divisors (126025059819).

210020021205 is a wasteful number, since it uses less digits than its factorization.

210020021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543636.

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 210020021205 its reverse (502120020012), we get a palindrome (712140041217).

The spelling of 210020021205 in words is "two hundred ten billion, twenty million, twenty-one thousand, two hundred five".