21003351354 has 40 divisors (see below), whose sum is σ = 47860765920. Its totient is φ = 6882450984.

The previous prime is 21003351323. The next prime is 21003351359. The reversal of 21003351354 is 45315330012.

It is a super-2 number, since 2×21003351354² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21003351359) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1089174 + ... + 1108289.

It is an arithmetic number, because the mean of its divisors is an integer number (1196519148).

Almost surely, 2^21003351354 is an apocalyptic number.

21003351354 is an abundant number, since it is smaller than the sum of its proper divisors (26857414566).

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

21003351354 is a wasteful number, since it uses less digits than its factorization.

21003351354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197536 (or 2197527 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21003351354 its reverse (45315330012), we get a palindrome (66318681366).

The spelling of 21003351354 in words is "twenty-one billion, three million, three hundred fifty-one thousand, three hundred fifty-four".