2251621042 has 8 divisors (see below), whose sum is σ = 3684470832. Its totient is φ = 1023464100.

The previous prime is 2251621027. The next prime is 2251621063. The reversal of 2251621042 is 2401261522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2251620998 and 2251621016.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51173184 + ... + 51173227.

It is an arithmetic number, because the mean of its divisors is an integer number (460558854).

Almost surely, 2^2251621042 is an apocalyptic number.

2251621042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2251621042 is a deficient number, since it is larger than the sum of its proper divisors (1432849790).

2251621042 is a wasteful number, since it uses less digits than its factorization.

2251621042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102346424.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2251621042 is about 47451.2491089539. The cubic root of 2251621042 is about 1310.6853128099.

Adding to 2251621042 its reverse (2401261522), we get a palindrome (4652882564).

The spelling of 2251621042 in words is "two billion, two hundred fifty-one million, six hundred twenty-one thousand, forty-two".