1551132310021 has 12 divisors (see below), whose sum is σ = 1804399517388. Its totient is φ = 1329526420992.

The previous prime is 1551132310009. The next prime is 1551132310033. The reversal of 1551132310021 is 1200132311551.

It is an interprime number because it is at equal distance from previous prime (1551132310009) and next prime (1551132310033).

It can be written as a sum of positive squares in 2 ways, for example, as 299631432996 + 1251500877025 = 547386^2 + 1118705^2 .

It is not a de Polignac number, because 1551132310021 - 2⁹ = 1551132309509 is a prime.

It is a super-2 number, since 2×1551132310021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551132310081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6433765 + ... + 6670501.

It is an arithmetic number, because the mean of its divisors is an integer number (150366626449).

Almost surely, 2^{1551132310021} is an apocalyptic number.

It is an amenable number.

1551132310021 is a deficient number, since it is larger than the sum of its proper divisors (253267207367).

1551132310021 is a wasteful number, since it uses less digits than its factorization.

1551132310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370468 (or 370461 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 1551132310021 its reverse (1200132311551), we get a palindrome (2751264621572).

The spelling of 1551132310021 in words is "one trillion, five hundred fifty-one billion, one hundred thirty-two million, three hundred ten thousand, twenty-one".