21072950 has 12 divisors (see below), whose sum is σ = 39195780. Its totient is φ = 8429160.

The previous prime is 21072923. The next prime is 21072973. The reversal of 21072950 is 5927012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210680 + ... + 210779.

It is an arithmetic number, because the mean of its divisors is an integer number (3266315).

Almost surely, 2^21072950 is an apocalyptic number.

21072950 is a deficient number, since it is larger than the sum of its proper divisors (18122830).

21072950 is a wasteful number, since it uses less digits than its factorization.

21072950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421471 (or 421466 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 21072950 is about 4590.5282920379. The cubic root of 21072950 is about 276.2115143318.

Adding to 21072950 its reverse (5927012), we get a palindrome (26999962).

It can be divided in two parts, 21072 and 950, that added together give a palindrome (22022).

The spelling of 21072950 in words is "twenty-one million, seventy-two thousand, nine hundred fifty".