1225561367021 has 16 divisors (see below), whose sum is σ = 1302509377920. Its totient is φ = 1150737477120.

The previous prime is 1225561366961. The next prime is 1225561367027. The reversal of 1225561367021 is 1207631655221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225561367021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1225561367021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225561367027) 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, 1375436 + ... + 2083973.

It is an arithmetic number, because the mean of its divisors is an integer number (81406836120).

Almost surely, 2^{1225561367021} is an apocalyptic number.

It is an amenable number.

1225561367021 is a deficient number, since it is larger than the sum of its proper divisors (76948010899).

1225561367021 is a wasteful number, since it uses less digits than its factorization.

1225561367021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459716.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 1225561367021 in words is "one trillion, two hundred twenty-five billion, five hundred sixty-one million, three hundred sixty-seven thousand, twenty-one".