1402121381 has 2 divisors, whose sum is σ = 1402121382. Its totient is φ = 1402121380.

The previous prime is 1402121353. The next prime is 1402121411. The reversal of 1402121381 is 1831212041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1166222500 + 235898881 = 34150^2 + 15359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1402121381 is a prime.

It is a super-2 number, since 2×1402121381² = 3931888734114694322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1402121311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701060690 + 701060691.

It is an arithmetic number, because the mean of its divisors is an integer number (701060691).

Almost surely, 2^1402121381 is an apocalyptic number.

It is an amenable number.

1402121381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1402121381 is an equidigital number, since it uses as much as digits as its factorization.

1402121381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1402121381 is about 37444.9112831103. The cubic root of 1402121381 is about 1119.2536963221.

The spelling of 1402121381 in words is "one billion, four hundred two million, one hundred twenty-one thousand, three hundred eighty-one".