1972021361569 has 16 divisors (see below), whose sum is σ = 2322550476288. Its totient is φ = 1639007030592.

The previous prime is 1972021361533. The next prime is 1972021361587. The reversal of 1972021361569 is 9651631202791.

It is a cyclic number.

It is not a de Polignac number, because 1972021361569 - 2²³ = 1972012972961 is a prime.

It is a super-2 number, since 2×1972021361569² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1972021361509) 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, 12917257 + ... + 13069030.

It is an arithmetic number, because the mean of its divisors is an integer number (145159404768).

Almost surely, 2^{1972021361569} is an apocalyptic number.

It is an amenable number.

1972021361569 is a deficient number, since it is larger than the sum of its proper divisors (350529114719).

1972021361569 is a wasteful number, since it uses less digits than its factorization.

1972021361569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25986624.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 1972021361569 in words is "one trillion, nine hundred seventy-two billion, twenty-one million, three hundred sixty-one thousand, five hundred sixty-nine".