2102220525242 has 4 divisors (see below), whose sum is σ = 3153330787866. Its totient is φ = 1051110262620.

The previous prime is 2102220525239. The next prime is 2102220525247. The reversal of 2102220525242 is 2425250222012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1493775284401 + 608445240841 = 1222201^2 + 780029^2 .

It is a super-2 number, since 2×2102220525242² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2102220525247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525555131309 + ... + 525555131312.

Almost surely, 2^{2102220525242} is an apocalyptic number.

2102220525242 is a deficient number, since it is larger than the sum of its proper divisors (1051110262624).

2102220525242 is a wasteful number, since it uses less digits than its factorization.

2102220525242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051110262623.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 2102220525242 its reverse (2425250222012), we get a palindrome (4527470747254).

The spelling of 2102220525242 in words is "two trillion, one hundred two billion, two hundred twenty million, five hundred twenty-five thousand, two hundred forty-two".