1215140202451 has 4 divisors (see below), whose sum is σ = 1388731659952. Its totient is φ = 1041548744952.

The previous prime is 1215140202431. The next prime is 1215140202473. The reversal of 1215140202451 is 1542020415121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1215140202451 - 2²⁷ = 1215005984723 is a prime.

It is a super-2 number, since 2×1215140202451² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1215140202431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86795728740 + ... + 86795728753.

It is an arithmetic number, because the mean of its divisors is an integer number (347182914988).

Almost surely, 2^{1215140202451} is an apocalyptic number.

1215140202451 is a deficient number, since it is larger than the sum of its proper divisors (173591457501).

1215140202451 is an equidigital number, since it uses as much as digits as its factorization.

1215140202451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173591457500.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 1215140202451 its reverse (1542020415121), we get a palindrome (2757160617572).

The spelling of 1215140202451 in words is "one trillion, two hundred fifteen billion, one hundred forty million, two hundred two thousand, four hundred fifty-one".