1025721621672 has 64 divisors (see below), whose sum is σ = 2843282036160. Its totient is φ = 305729241600.

The previous prime is 1025721621623. The next prime is 1025721621707. The reversal of 1025721621672 is 2761261275201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31830693 + ... + 31862900.

It is an arithmetic number, because the mean of its divisors is an integer number (44426281815).

Almost surely, 2^{1025721621672} is an apocalyptic number.

1025721621672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1025721621672 is an abundant number, since it is smaller than the sum of its proper divisors (1817560414488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1025721621672 is a wasteful number, since it uses less digits than its factorization.

1025721621672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63693674 (or 63693670 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

Adding to 1025721621672 its reverse (2761261275201), we get a palindrome (3786982896873).

The spelling of 1025721621672 in words is "one trillion, twenty-five billion, seven hundred twenty-one million, six hundred twenty-one thousand, six hundred seventy-two".