1377738021 has 32 divisors (see below), whose sum is σ = 2161945728. Its totient is φ = 771031040.

The previous prime is 1377738001. The next prime is 1377738049. The reversal of 1377738021 is 1208377731.

It is a cyclic number.

It is not a de Polignac number, because 1377738021 - 2⁵ = 1377737989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377738001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6565 + ... + 52901.

It is an arithmetic number, because the mean of its divisors is an integer number (67560804).

Almost surely, 2^1377738021 is an apocalyptic number.

1377738021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1377738021 is a deficient number, since it is larger than the sum of its proper divisors (784207707).

1377738021 is a wasteful number, since it uses less digits than its factorization.

1377738021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46421.

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 1377738021 is about 37117.8935420640. The cubic root of 1377738021 is about 1112.7276533821.

The spelling of 1377738021 in words is "one billion, three hundred seventy-seven million, seven hundred thirty-eight thousand, twenty-one".