21320543050 has 24 divisors (see below), whose sum is σ = 39661006176. Its totient is φ = 8527185840.

The previous prime is 21320543033. The next prime is 21320543071. The reversal of 21320543050 is 5034502312.

It is a super-4 number, since 4×21320543050⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496537 + ... + 537763.

It is an arithmetic number, because the mean of its divisors is an integer number (1652541924).

Almost surely, 2^21320543050 is an apocalyptic number.

21320543050 is a deficient number, since it is larger than the sum of its proper divisors (18340463126).

21320543050 is a wasteful number, since it uses less digits than its factorization.

21320543050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51582 (or 51577 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The spelling of 21320543050 in words is "twenty-one billion, three hundred twenty million, five hundred forty-three thousand, fifty".