21350077554 has 32 divisors (see below), whose sum is σ = 46154513664. Its totient is φ = 6545007360.

The previous prime is 21350077523. The next prime is 21350077577. The reversal of 21350077554 is 45577005312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483879 + ... + 526154.

It is an arithmetic number, because the mean of its divisors is an integer number (1442328552).

Almost surely, 2^21350077554 is an apocalyptic number.

21350077554 is an abundant number, since it is smaller than the sum of its proper divisors (24804436110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21350077554 is a wasteful number, since it uses less digits than its factorization.

21350077554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010322.

The product of its (nonzero) digits is 147000, while the sum is 39.

The spelling of 21350077554 in words is "twenty-one billion, three hundred fifty million, seventy-seven thousand, five hundred fifty-four".