21242403044 has 6 divisors (see below), whose sum is σ = 37174205334. Its totient is φ = 10621201520.

The previous prime is 21242403019. The next prime is 21242403071. The reversal of 21242403044 is 44030424212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12479570944 + 8762832100 = 111712^2 + 93610^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2655300377 + ... + 2655300384.

It is an arithmetic number, because the mean of its divisors is an integer number (6195700889).

Almost surely, 2^21242403044 is an apocalyptic number.

It is an amenable number.

21242403044 is a deficient number, since it is larger than the sum of its proper divisors (15931802290).

21242403044 is a wasteful number, since it uses less digits than its factorization.

21242403044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310600765 (or 5310600763 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21242403044 its reverse (44030424212), we get a palindrome (65272827256).

The spelling of 21242403044 in words is "twenty-one billion, two hundred forty-two million, four hundred three thousand, forty-four".