1221352525 has 12 divisors (see below), whose sum is σ = 1514913952. Its totient is φ = 976800240.

The previous prime is 1221352513. The next prime is 1221352541. The reversal of 1221352525 is 5252531221.

It is not a de Polignac number, because 1221352525 - 2¹⁹ = 1220828237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221352493 and 1221352502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150112 + ... + 158038.

Almost surely, 2^1221352525 is an apocalyptic number.

It is an amenable number.

1221352525 is a deficient number, since it is larger than the sum of its proper divisors (293561427).

1221352525 is an equidigital number, since it uses as much as digits as its factorization.

1221352525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14100 (or 14095 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 1221352525 is about 34947.8543690453. The cubic root of 1221352525 is about 1068.9244513058.

Adding to 1221352525 its reverse (5252531221), we get a palindrome (6473883746).

The spelling of 1221352525 in words is "one billion, two hundred twenty-one million, three hundred fifty-two thousand, five hundred twenty-five".