21253260010642 has 16 divisors (see below), whose sum is σ = 34778180650464. Its totient is φ = 9660539728000.

The previous prime is 21253260010531. The next prime is 21253260010663. The reversal of 21253260010642 is 24601006235212.

It is a super-2 number, since 2×21253260010642² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21253260010598 and 21253260010607.

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, 5654217 + ... + 8629987.

It is an arithmetic number, because the mean of its divisors is an integer number (2173636290654).

Almost surely, 2^{21253260010642} is an apocalyptic number.

21253260010642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21253260010642 is a deficient number, since it is larger than the sum of its proper divisors (13524920639822).

21253260010642 is a wasteful number, since it uses less digits than its factorization.

21253260010642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300425.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21253260010642 its reverse (24601006235212), we get a palindrome (45854266245854).

The spelling of 21253260010642 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred sixty million, ten thousand, six hundred forty-two".