2151210202154 has 8 divisors (see below), whose sum is σ = 3475031865060. Its totient is φ = 992866247136.

The previous prime is 2151210202133. The next prime is 2151210202157. The reversal of 2151210202154 is 4512020121512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2050323291025 + 100886911129 = 1431895^2 + 317627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 82738853929 = 2151210202154 / (2 + 1 + 5 + 1 + 2 + 1 + 0 + 2 + 0 + 2 + 1 + 5 + 4).

It is not an unprimeable number, because it can be changed into a prime (2151210202157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41369426939 + ... + 41369426990.

Almost surely, 2^{2151210202154} is an apocalyptic number.

2151210202154 is a deficient number, since it is larger than the sum of its proper divisors (1323821662906).

2151210202154 is a wasteful number, since it uses less digits than its factorization.

2151210202154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82738853944.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 2151210202154 its reverse (4512020121512), we get a palindrome (6663230323666).

The spelling of 2151210202154 in words is "two trillion, one hundred fifty-one billion, two hundred ten million, two hundred two thousand, one hundred fifty-four".