1257072021018 has 48 divisors (see below), whose sum is σ = 2971812182976. Its totient is φ = 380860269120.

The previous prime is 1257072021013. The next prime is 1257072021041. The reversal of 1257072021018 is 8101202707521.

1257072021018 is a `hidden beast` number, since 1 + 2 + 570 + 72 + 0 + 2 + 1 + 0 + 18 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1257072021013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 486555 + ... + 1658577.

It is an arithmetic number, because the mean of its divisors is an integer number (61912753812).

Almost surely, 2^{1257072021018} is an apocalyptic number.

1257072021018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1257072021018 is an abundant number, since it is smaller than the sum of its proper divisors (1714740161958).

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

1257072021018 is a wasteful number, since it uses less digits than its factorization.

1257072021018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177459 (or 1177456 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

Adding to 1257072021018 its reverse (8101202707521), we get a palindrome (9358274728539).

The spelling of 1257072021018 in words is "one trillion, two hundred fifty-seven billion, seventy-two million, twenty-one thousand, eighteen".