21376155554 has 16 divisors (see below), whose sum is σ = 34662019392. Its totient is φ = 9828401808.

The previous prime is 21376155511. The next prime is 21376155557. The reversal of 21376155554 is 45555167312.

It is a super-4 number, since 4×21376155554⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21376155557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1556204 + ... + 1569879.

It is an arithmetic number, because the mean of its divisors is an integer number (2166376212).

Almost surely, 2^21376155554 is an apocalyptic number.

21376155554 is a deficient number, since it is larger than the sum of its proper divisors (13285863838).

21376155554 is a wasteful number, since it uses less digits than its factorization.

21376155554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126361.

The product of its digits is 630000, while the sum is 44.

The spelling of 21376155554 in words is "twenty-one billion, three hundred seventy-six million, one hundred fifty-five thousand, five hundred fifty-four".