21010412 has 6 divisors (see below), whose sum is σ = 36768228. Its totient is φ = 10505204.

The previous prime is 21010411. The next prime is 21010427. The reversal of 21010412 is 21401012.

It is a junction number, because it is equal to n+sod(n) for n = 21010393 and 21010402.

It is not an unprimeable number, because it can be changed into a prime (21010411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626298 + ... + 2626305.

It is an arithmetic number, because the mean of its divisors is an integer number (6128038).

Almost surely, 2^21010412 is an apocalyptic number.

It is an amenable number.

21010412 is a deficient number, since it is larger than the sum of its proper divisors (15757816).

21010412 is a wasteful number, since it uses less digits than its factorization.

21010412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252607 (or 5252605 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21010412 is about 4583.7115965122. The cubic root of 21010412 is about 275.9380068005.

Adding to 21010412 its reverse (21401012), we get a palindrome (42411424).

The spelling of 21010412 in words is "twenty-one million, ten thousand, four hundred twelve".