21020220201 has 16 divisors (see below), whose sum is σ = 29568695040. Its totient is φ = 13245944400.

The previous prime is 21020220167. The next prime is 21020220211. The reversal of 21020220201 is 10202202012.

It is not a de Polignac number, because 21020220201 - 2¹⁴ = 21020203817 is a prime.

It is a super-3 number, since 3×21020220201³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020220211) 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, 390975 + ... + 441476.

It is an arithmetic number, because the mean of its divisors is an integer number (1848043440).

Almost surely, 2^21020220201 is an apocalyptic number.

It is an amenable number.

21020220201 is a deficient number, since it is larger than the sum of its proper divisors (8548474839).

21020220201 is a wasteful number, since it uses less digits than its factorization.

21020220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832916.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21020220201 its reverse (10202202012), we get a palindrome (31222422213).

It can be divided in two parts, 2 and 1020220201, that multiplied together give a palindrome (2040440402).

The spelling of 21020220201 in words is "twenty-one billion, twenty million, two hundred twenty thousand, two hundred one".