21021401234 has 16 divisors (see below), whose sum is σ = 31693009536. Its totient is φ = 10457101200.

The previous prime is 21021401209. The next prime is 21021401243. The reversal of 21021401234 is 43210412012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1430444 + ... + 1445064.

It is an arithmetic number, because the mean of its divisors is an integer number (1980813096).

Almost surely, 2^21021401234 is an apocalyptic number.

21021401234 is a deficient number, since it is larger than the sum of its proper divisors (10671608302).

21021401234 is a wasteful number, since it uses less digits than its factorization.

21021401234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18241.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21021401234 its reverse (43210412012), we get a palindrome (64231813246).

The spelling of 21021401234 in words is "twenty-one billion, twenty-one million, four hundred one thousand, two hundred thirty-four".