3787221252221 has 16 divisors (see below), whose sum is σ = 4307014411776. Its totient is φ = 3298877400000.

The previous prime is 3787221252211. The next prime is 3787221252247. The reversal of 3787221252221 is 1222521227873.

It is a de Polignac number, because none of the positive numbers 2^k-3787221252221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3787221252211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54946850 + ... + 55015731.

It is an arithmetic number, because the mean of its divisors is an integer number (269188400736).

Almost surely, 2^{3787221252221} is an apocalyptic number.

3787221252221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3787221252221 is a deficient number, since it is larger than the sum of its proper divisors (519793159555).

3787221252221 is a wasteful number, since it uses less digits than its factorization.

3787221252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109962724.

The product of its digits is 376320, while the sum is 44.

The spelling of 3787221252221 in words is "three trillion, seven hundred eighty-seven billion, two hundred twenty-one million, two hundred fifty-two thousand, two hundred twenty-one".