721723425450042 has 16 divisors (see below), whose sum is σ = 1443450900478752. Its totient is φ = 240573800220240.

The previous prime is 721723425449953. The next prime is 721723425450107. The reversal of 721723425450042 is 240054524327127.

It is a junction number, because it is equal to n+sod(n) for n = 721723425449973 and 721723425450000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166413108 + ... + 170694959.

It is an arithmetic number, because the mean of its divisors is an integer number (90215681279922).

Almost surely, 2^{721723425450042} is an apocalyptic number.

721723425450042 is an abundant number, since it is smaller than the sum of its proper divisors (721727475028710).

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

721723425450042 is a wasteful number, since it uses less digits than its factorization.

721723425450042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337464893.

The product of its (nonzero) digits is 3763200, while the sum is 48.

Adding to 721723425450042 its reverse (240054524327127), we get a palindrome (961777949777169).

The spelling of 721723425450042 in words is "seven hundred twenty-one trillion, seven hundred twenty-three billion, four hundred twenty-five million, four hundred fifty thousand, forty-two".