1400237666021 has 16 divisors (see below), whose sum is σ = 1453235612400. Its totient is φ = 1347558739968.

The previous prime is 1400237666017. The next prime is 1400237666033. The reversal of 1400237666021 is 1206667320041.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 84137704225 + 1316099961796 = 290065^2 + 1147214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400237666021 - 2² = 1400237666017 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 (1400237666011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16800965 + ... + 16884101.

It is an arithmetic number, because the mean of its divisors is an integer number (90827225775).

Almost surely, 2^{1400237666021} is an apocalyptic number.

It is an amenable number.

1400237666021 is a deficient number, since it is larger than the sum of its proper divisors (52997946379).

1400237666021 is a wasteful number, since it uses less digits than its factorization.

1400237666021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85048.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 1400237666021 in words is "one trillion, four hundred billion, two hundred thirty-seven million, six hundred sixty-six thousand, twenty-one".