211421402 has 4 divisors (see below), whose sum is σ = 317132106. Its totient is φ = 105710700.

The previous prime is 211421387. The next prime is 211421437. The reversal of 211421402 is 204124112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 211149961 + 271441 = 14531^2 + 521^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52855349 + ... + 52855352.

Almost surely, 2^211421402 is an apocalyptic number.

211421402 is a deficient number, since it is larger than the sum of its proper divisors (105710704).

211421402 is a wasteful number, since it uses less digits than its factorization.

211421402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105710703.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211421402 is about 14540.3370662444. The cubic root of 211421402 is about 595.7302448000.

Adding to 211421402 its reverse (204124112), we get a palindrome (415545514).

It can be divided in two parts, 2114 and 21402, that multiplied together give a triangular number (45243828 = T₉₅₁₂).

The spelling of 211421402 in words is "two hundred eleven million, four hundred twenty-one thousand, four hundred two".