21377370043553 has 16 divisors (see below), whose sum is σ = 22311291214080. Its totient is φ = 20457363681216.

The previous prime is 21377370043531. The next prime is 21377370043621. The reversal of 21377370043553 is 35534007377312.

It is a cyclic number.

It is not a de Polignac number, because 21377370043553 - 2¹² = 21377370039457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21377370040553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5611325 + ... + 8616362.

It is an arithmetic number, because the mean of its divisors is an integer number (1394455700880).

Almost surely, 2^{21377370043553} is an apocalyptic number.

It is an amenable number.

21377370043553 is a deficient number, since it is larger than the sum of its proper divisors (933921170527).

21377370043553 is a wasteful number, since it uses less digits than its factorization.

21377370043553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14228176.

The product of its (nonzero) digits is 5556600, while the sum is 50.

The spelling of 21377370043553 in words is "twenty-one trillion, three hundred seventy-seven billion, three hundred seventy million, forty-three thousand, five hundred fifty-three".