21437328702461 has 16 divisors (see below), whose sum is σ = 25000089609600. Its totient is φ = 18001765002048.

The previous prime is 21437328702457. The next prime is 21437328702469. The reversal of 21437328702461 is 16420782373412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21437328702461 - 2² = 21437328702457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437328702469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88456406 + ... + 88698423.

It is an arithmetic number, because the mean of its divisors is an integer number (1562505600600).

Almost surely, 2^{21437328702461} is an apocalyptic number.

It is an amenable number.

21437328702461 is a deficient number, since it is larger than the sum of its proper divisors (3562760907139).

21437328702461 is a wasteful number, since it uses less digits than its factorization.

21437328702461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177155188.

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 21437328702461 in words is "twenty-one trillion, four hundred thirty-seven billion, three hundred twenty-eight million, seven hundred two thousand, four hundred sixty-one".