1240857724821 has 64 divisors (see below), whose sum is σ = 1948090023936. Its totient is φ = 692628019200.

The previous prime is 1240857724817. The next prime is 1240857724823. The reversal of 1240857724821 is 1284277580421.

It is not a de Polignac number, because 1240857724821 - 2² = 1240857724817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240857724823) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 596278501 + ... + 596280581.

It is an arithmetic number, because the mean of its divisors is an integer number (30438906624).

Almost surely, 2^{1240857724821} is an apocalyptic number.

1240857724821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1240857724821 is a deficient number, since it is larger than the sum of its proper divisors (707232299115).

1240857724821 is a wasteful number, since it uses less digits than its factorization.

1240857724821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562.

The product of its (nonzero) digits is 2007040, while the sum is 51.

The spelling of 1240857724821 in words is "one trillion, two hundred forty billion, eight hundred fifty-seven million, seven hundred twenty-four thousand, eight hundred twenty-one".