2101220402 has 16 divisors (see below), whose sum is σ = 3220129080. Its totient is φ = 1028087808.

The previous prime is 2101220369. The next prime is 2101220411. The reversal of 2101220402 is 2040221012.

It can be written as a sum of positive squares in 4 ways, for example, as 1563490681 + 537729721 = 39541^2 + 23189^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43583 + ... + 78114.

Almost surely, 2^2101220402 is an apocalyptic number.

2101220402 is a deficient number, since it is larger than the sum of its proper divisors (1118908678).

2101220402 is a wasteful number, since it uses less digits than its factorization.

2101220402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121885.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2101220402 is about 45839.0706930234. The cubic root of 2101220402 is about 1280.8271838336.

Adding to 2101220402 its reverse (2040221012), we get a palindrome (4141441414).

It can be divided in two parts, 21012 and 20402, that multiplied together give a palindrome (428686824).

The spelling of 2101220402 in words is "two billion, one hundred one million, two hundred twenty thousand, four hundred two".